CN110425314B - Base and fluid pump - Google Patents
Base and fluid pump Download PDFInfo
- Publication number
- CN110425314B CN110425314B CN201910651786.6A CN201910651786A CN110425314B CN 110425314 B CN110425314 B CN 110425314B CN 201910651786 A CN201910651786 A CN 201910651786A CN 110425314 B CN110425314 B CN 110425314B
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- base
- pressure
- flow path
- hole
- mounting hole
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- 239000012530 fluid Substances 0.000 title claims abstract description 48
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 230000004323 axial length Effects 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 72
- 239000010705 motor oil Substances 0.000 description 10
- 230000007704 transition Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 7
- 238000003825 pressing Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Safety Valves (AREA)
Abstract
The invention provides a base and a fluid pump, which are provided with a fluid inflow hole (11) and a fluid outflow hole (12), wherein a mounting hole (166) is formed in the side wall of the base (1), a pressure regulating device (16) is arranged in the mounting hole (166), an overflow flow path (163) is arranged in the base (1), the overflow flow path (163) is used for communicating the fluid outflow hole (12) with the mounting hole (166), the base (1) further comprises a pressure regulating guarantee flow path (141), the pressure regulating device (16) is arranged in the mounting hole (166), and when a safety valve (160) of the pressure regulating device (16) is opened, the pressure regulating guarantee flow path (141) is used for communicating the mounting hole (166) with a base negative pressure chamber (14). According to the invention, along with the opening of the safety valve of the pressure regulating device, the fluid accumulated in the mounting hole can flow out of the base negative pressure chamber, the reaction force to the safety valve of the pressure regulating device can not be generated due to pressure, the movement of the safety valve can not be blocked additionally, and the safety valve can be opened smoothly.
Description
Technical Field
The invention relates to the technical field of fluid pumps, in particular to a base and a fluid pump.
Background
A fluid pump such as an electric motor oil pump is generally used in a vehicle having an idle reduction function, and includes an oil pump, a check valve, a valve body, an oil supply unit, and an oil pan in this order, and is returned from the oil pan to the oil pump.
A pressure relief valve or a pressure limiting valve is usually provided in the fluid pump, and when the fluid pressure in the flow path exceeds a predetermined pressure, the valve opens to release a certain amount of fluid to reduce the fluid pressure in the flow path below the predetermined pressure.
Chinese patent application publication CN104061152a discloses a relief valve in which when the oil pressure in the oil tank on the discharge side is higher than the set pressure, the spool valve withdraws the compression spring, i.e., opens the valve, and overflows a part of the oil into the oil tank on the suction side, thereby maintaining the oil pressure in the oil passage at the set pressure. However, since the spring chamber is a relatively closed space, when the spool valve moves in the relief direction, the air in the spring chamber and the accumulated oil are gradually compressed, and the spool valve may be retreated by an indeterminate and uncontrollable resistance, which hinders the normal opening operation of the spool valve, and thus the oil pump may not work normally, and the vehicle may malfunction.
Disclosure of Invention
In view of the above-described drawbacks of the prior art, an object of the present invention is to provide a base and a fluid pump that can solve the problem of the valve body opening of the relief valve being blocked with a simple structure and at low cost.
To achieve the above and other objects, the present invention provides a base for a fluid pump, wherein the base has a base negative pressure chamber, a mounting hole for mounting a pressure adjusting device is provided in the base, an overflow flow path is provided in the base, the overflow flow path communicates with the base negative pressure chamber when the pressure adjusting device is mounted on the base and opened, and the overflow flow path is shut off from the base negative pressure chamber when the pressure adjusting device is closed. The base also comprises a pressure regulation guarantee flow path, and when the pressure regulating device is installed on the base and opened, the pressure regulation guarantee flow path communicates the installation hole with the base negative pressure chamber.
In an embodiment of the invention, the base further includes a pressure adjustment ensuring flow path, the pressure adjustment device is installed in the installation hole, and when the pressure adjustment device is opened, the pressure adjustment ensuring flow path communicates the installation hole with the base negative pressure chamber.
In an embodiment of the present invention, the pressure adjusting device includes a relief valve, an elastic element, and a bearing member, and the relief valve is disposed near the overflow flow path, and one end of the elastic element abuts against the relief valve, and the other end abuts against the bearing member, so as to load the relief valve in a direction to close the pressure adjusting device.
In one embodiment of the present invention, the pressure adjustment assurance flow path extends from an axial end face of the base toward an axial inner side of the base.
In an embodiment of the invention, the pressure regulating device comprises a relief valve arranged close to the overflow flow path, the pressure regulating ensuring flow path extending over a length substantially parallel to the axial direction of the mounting hole being larger than the axial length of the relief valve.
In one embodiment of the invention, the bottom of the pressure adjustment assurance flow path communicates with the mounting hole (166) in terms of the axial direction of the base. In an embodiment of the present invention, the circumferential dimension of the portion of the mounting hole communicating with the pressure adjustment ensuring flow path is 8% to 80% of the aperture of the portion.
In an embodiment of the invention, the pressure regulating guarantee flow path is integrally formed with the base negative pressure chamber during the base forming.
The invention also provides a fluid pump, wherein the fluid pump comprises the base according to any one of the technical schemes.
In the base and the fluid pump according to the present invention configured as described above, when the pressure in the base positive pressure chamber exceeds the predetermined pressure, the relief valve of the pressure regulator is pushed to move in the opening direction by the relief fluid in the relief flow passage, and at this time, since the relief flow passage is provided with the pressure regulation ensuring flow passage communicating with the base negative pressure chamber, the fluid accumulated in the mounting hole flows out of the base negative pressure chamber with the opening of the pressure regulator, and the pressure regulator is not blocked by the pressure, and can be smoothly opened, so that the fluid pressure in the fluid working flow passage is maintained within the predetermined pressure, and the base and the fluid pump have excellent reliability.
In addition, the base and the fluid pump according to the present invention configured as described above are configured such that the pressure adjustment ensuring flow path is integrally formed with the base negative pressure chamber at the time of base molding, so that the manufacturing cost of the whole product can be reduced.
Drawings
Fig. 1 shows an exploded view of a fluid pump according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram of the operation of the rotor in the fluid pump.
Fig. 3 shows a front view of the base in the fluid pump.
Fig. 4 shows a section A-A in fig. 3.
Fig. 5 shows a partial enlarged view of the base negative pressure chamber.
Fig. 6 shows a front view of the base in the fluid pump.
Fig. 7 shows a schematic view of a pressure regulating device according to another embodiment of the invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
The fluid pump of the present embodiment is a motor oil pump 100 used in an idle reduction system, and a relief oil passage is provided in the motor oil pump 100, and when the pressure in the main passage exceeds a predetermined pressure, a relief valve in the relief oil passage is opened to release pressure, so that the oil pressure pumped from the motor oil pump 100 is ensured not to exceed the predetermined pressure all the time.
The motor oil pump 100 is an internal gear pump. Fig. 1 is a perspective exploded view of an electric motor oil pump 100 according to an embodiment, and fig. 2 is a schematic diagram of the operation of the ring gear pump. As shown in fig. 1, the motor oil pump 100 is formed by axially assembling a base 1, a pump body 2, a motor 3, and a rear cover 4, and is fixedly connected with a fastener. A chamber 23 is formed in one axial wall surface of the pump body 2, and a rotor assembly composed of an outer rotor 21 and an inner rotor 22 engaged with the outer rotor 21 is rotatably fitted in the chamber 23. One end of a motor rotating shaft 33 of the motor 3 is externally sleeved with a motor rotor 32, and the other end of the motor rotating shaft is inserted into the pump body 2 from the shaft hole 26 of the pump body 2 and is connected with the inner rotor 22. After the motor 3 is started, the motor rotating shaft 33 rotates under the interaction of the motor rotor 32 and the motor stator 34, the inner rotor 22 is driven by the motor rotating shaft 33 to rotate, and an oil suction cavity 271 and an oil pressing cavity 281 are formed in the cavity 23 according to the change of the liquid volume between the gears of the inner rotor 22 and the outer rotor 21.
In this embodiment, the base 1 is provided with an oil inlet 11 and an oil outlet 12 penetrating through the base 1, wherein the oil suction cavity 271 is communicated with the oil inlet 11, the oil pressure cavity 281 is communicated with the oil outlet 12, and oil is sucked from the oil inlet 11 and pumped out from the oil outlet 12 during the continuous rotation of the rotor assembly.
The working principle of the ring gear pump is explained in detail with reference to fig. 2. As shown in fig. 2, the inner rotor 22 and the outer rotor 21 are internally meshed, 6 external teeth are formed on the inner rotor 22, 7 internal teeth are formed on the outer rotor 21 correspondingly, the inner rotor 22 rotates clockwise in the direction shown in the drawing, each external tooth of the inner rotor 22 is meshed with different parts of the internal teeth of the outer rotor 21, 7 inter-tooth spaces formed between the inner rotor 22 and the outer rotor 21 in fig. 2 are respectively formed by the teeth 224 and 225, the teeth 225 and 226, the teeth 226 and 221, and the outer rotor 21, wherein the volumes of the inter-tooth spaces are respectively reduced from large to small, a pressure oil cavity 281, a pressure oil cavity 282 and a pressure oil cavity 283 are respectively formed on the left side of the inner rotor 22, and the pressure oil cavity 281, the pressure oil cavity 282 and the pressure oil cavity 283 are respectively communicated with a positive pressure area 28 on the pump body 2; the teeth 221 and 222, the teeth 222 and 223, and the teeth 223 and 224 respectively form three inter-tooth spaces with the outer rotor 21, the volume of each inter-tooth space is changed from small to large, the right side of the inner rotor 22 forms an oil suction cavity 271, an oil suction cavity 272 and an oil suction cavity 273, and the oil suction cavity 272 and the oil suction cavity 273 are respectively communicated with the negative pressure area 27 on the pump body 2. Wherein, the negative pressure area 27 is communicated with the oil suction cavity 271, the oil suction cavity 272 and the oil suction cavity 273, and the positive pressure area 28 is communicated with the oil pressing cavity 281, the oil pressing cavity 282 and the oil pressing cavity 283. As the inner rotor 22 rotates in the direction shown, oil in the oil suction chamber 273, the oil suction chamber 272, and the oil suction chamber 271 is sequentially sent from the negative pressure region 27 to the positive pressure region 28.
Fig. 3 shows a front view of the base 1 in the motor oil pump 100. Figure 4 shows a cross-sectional view A-A of figure 3.
Referring to fig. 3 and 4, a base negative pressure chamber 14 and a base positive pressure chamber 15 are provided on a base back surface 101, that is, an axial end surface connected to the pump body 2, and the base negative pressure chamber 14 and the base positive pressure chamber 15 are formed in a long hole shape extending substantially in the circumferential direction of the base 1. Wherein the base negative pressure chamber 14 communicates with the oil suction chamber 271, and the base positive pressure chamber 15 communicates with the oil pressure chamber 281. The side wall of the base 1 is provided with a mounting hole 166, and the mounting hole 166 communicates with the oil outlet 12 through an overflow passage 163. The pressure regulator 16 is installed in the installation hole 166, and when the fluid pressure in the base positive pressure chamber 15 is too high, the pressure regulator 16 is opened, and at this time, the overflow flow path 163 communicates with the base negative pressure chamber 14, and part of the fluid in the installation hole is discharged into the base negative pressure chamber 14, thereby realizing the regulation of the pressure in the flow path. When the fluid pressure in the base positive pressure chamber 15 returns to the normal oil pressure, the pressure regulator 16 is reset, and the communication between the relief flow path 163 and the base negative pressure chamber 14 is cut off.
In the present embodiment, the mounting hole 166 includes a receiving hole 164 and a screw hole 165, and the receiving hole 164 has a larger aperture than the overflow path 163 connected thereto, so that a stepped surface 167 is formed therebetween. The head of the pressure regulator 16 is provided with a relief valve 160, a loading spring 161 is provided behind the relief valve 160, and when the pressure of the base plenum 15 does not exceed a predetermined pressure, the relief valve 160 mounted in the mounting hole 166 is acted on by the loading force of the loading spring 161 provided behind it, the tip of the relief valve 160 abuts against the step surface 167, and the relief valve 160 is in a closed state, that is: a state in which the overflow channel 163 is shut off from the base negative pressure chamber 14; when the fluid pressure in the base plenum 15 is too high, the oil pressure from the base plenum 15 pushes the relief valve 160 of the pressure regulator 16 to open against the loading force of the loading spring 161, thereby communicating the relief flow path 163 with the base plenum 14, and the oil from the base plenum 15 flows into the base plenum 14 through the relief flow path 163; when the pressure in the flow path is lower than the predetermined pressure, the relief valve 160 returns to the closed state by the biasing spring 161 to shut off the communication between the relief flow path 163 and the base negative pressure chamber 14, and the pressure in the flow path is controlled to be within the predetermined pressure by the pressure regulator 16.
Fig. 5 gives an enlarged view of a part of the base negative pressure chamber 14. As shown in fig. 5, the base negative pressure chamber 14 includes a negative pressure chamber recess 142 and a pressure adjustment ensuring flow path 141, and the negative pressure chamber recess 142 functions to suck oil from the oil inlet hole 11 into the base negative pressure chamber 14, so that one end of the negative pressure chamber recess 142 communicates with the oil inlet hole 11, and the other end of the negative pressure chamber recess 142 communicates with the pressure adjustment ensuring flow path 141, and the pressure adjustment ensuring flow path 141 communicates with a receiving hole 164 extending from the base negative pressure chamber 14 in a direction substantially parallel to an axial direction of the mounting hole 166 and communicating with the mounting hole 166. In fig. 5, the pressure adjustment ensuring flow path 141 is shown. The bottom portion (in the thickness direction of the base 1) of the housing hole 164, but the pressure adjustment ensuring flow path 141 may include a portion parallel to the axial end surface of the base 1 and a portion that communicates the portion with the housing hole 164.
In the present embodiment, the pressure adjusting device 16 includes a relief valve 160, a loading spring 161, and a carrier member 162, the relief valve 160 is disposed near the relief flow path 163, one end of the loading spring 161 abuts against the relief valve 160, and the other end of the loading spring 161 is sleeved on the carrier member 162. Wherein the carrier member 162 is threadably coupled to the mounting hole 166. Specifically, according to fig. 4, the safety valve 160 is installed in the receiving hole 164, the safety valve 160 has a block shape corresponding to the receiving hole 164, and in this embodiment, has a cylindrical shape, and the safety valve 160 can be pushed by the overflow fluid to slide backward in the receiving hole 164. When the pressure of the base plenum 15 does not exceed the predetermined pressure, the relief valve 160 may abut against the stepped surface 167 to completely separate the mounting hole 166 from the relief flow path 163.
The loading spring 161 is accommodated in the accommodating hole 164, and other elastic elements can be used for the loading spring 161. The bearing member 162 includes a spring bearing portion 1621, a connecting portion 1622, and a tail portion 1623, the loading spring 161 is sleeved on the outer peripheral surface of the spring bearing portion 1621, the connecting portion 1622 is block-shaped corresponding to the threaded hole 165, and is cylindrical in this embodiment, the diameter of the connecting portion 1622 is larger than that of the spring bearing portion 1621, and during the assembly of the pressure regulator 16, the loading spring 161 is sleeved on the spring bearing portion 1621 and simultaneously abuts against the axial end surface of the connecting portion 1622.
When the pressure of the base plenum 15 does not exceed the predetermined pressure, the loading spring 161 may be of a natural length or may have a certain initial compression amount, and particularly when the fluid pressure of the oil outlet 12 is large, the present invention can set the predetermined pressure of the overflow by adjusting the initial compression amount of the loading spring 161.
When the pressure in the base plenum 15 exceeds the predetermined pressure, the fluid in the relief flow path 163 pushes the relief valve 160 of the pressure regulator 16 against the biasing force of the biasing spring 161, compressing the biasing spring 161 to move to the right in fig. 4 in the housing hole 164, and at this time, if the housing hole 164 is blocked by the relief valve 160 to form a closed space, the blocked fluid in the housing hole 164 will generate an extra resistance to the movement of the relief valve 160, which will prevent the relief valve 160 from moving smoothly to the predetermined position, resulting in a change in the opening pressure and even failure in opening, and the pressure regulator 16 will not realize the pressure regulating function.
In the present invention, since the pressure regulation ensuring flow path 141 communicating with the negative pressure chamber concave portion 142 is provided and the pressure regulation ensuring flow path 141 communicates with the receiving hole 164, the oil accumulated in the receiving hole 164 is discharged into the negative pressure chamber concave portion 142 through the pressure regulation ensuring flow path 141 in the process of moving the relief valve 160 to the right as viewed in fig. 4, and the oil sucked into the negative pressure chamber concave portion 142 from the oil inlet hole 11 merges, whereby it is seen that the fluid in the receiving hole 164 does not generate an additional resistance to the movement of the relief valve 160 since the receiving hole 164 is not completely blocked by the relief valve 160, and the relief valve 160 can be smoothly opened according to a prescribed opening pressure, so that the pressure regulating device 16 has a stable pressure regulating function.
The bottom of the pressure adjustment ensuring passage 141 may be connected to the mounting hole 166, and this structure may be realized by a machining process after the base is molded, or the pressure adjustment ensuring passage 141 and the negative pressure chamber recess 142 may be integrally molded during the base molding. The pressure adjustment ensuring flow path 141 is manufactured without performing an additional machining process by the integral molding, so that the process is simple and the manufacturing cost is low.
According to fig. 5, in the present embodiment, the pressure adjustment ensuring flow path 141 has a substantially long hole shape, and at the same time, the pressure adjustment ensuring flow path 141 extends in the axial direction of the mounting hole 166 by a length l, which exceeds the axial length of the relief valve 160 itself as shown in fig. 5, to ensure that the oil accumulated in the receiving hole 164 can be discharged from the pressure adjustment ensuring flow path 141 to the base negative pressure chamber 14 when the relief valve 160 is opened. If the extension length l is less than or equal to the axial length of the relief valve 160, the receiving hole 164 remains closed by the relief valve 160, and when the relief valve 160 is opened to move to the right as viewed in fig. 4, the receiving hole 164 becomes a closed space, and the oil or gas accumulated in the receiving hole 164 is blocked to hinder the movement of the relief valve 160, and thus the pressure adjustment and protection function cannot be performed.
Here, the shape of the pressure adjustment ensuring passage 141 is not limited to a long hole shape, and for example, the pressure adjustment ensuring passage 141 may be formed by directly making the axial dimension of the end of the negative pressure chamber concave portion 142 adjacent to the mounting hole 166 larger than the axial length of the relief valve 160 along the mounting hole 166.
Further, the circumferential dimension of the portion of the mounting hole 166 communicating with the pressure adjustment ensuring passage 141 needs to be within a suitable range, and when the dimension is too small, it is difficult to ensure that the oil accumulated in the receiving hole 164 smoothly enters the pressure adjustment ensuring passage 141, and when the dimension is too large, smooth movement of the relief valve 160 in the receiving hole 164 may be hindered. In the present embodiment, the circumferential dimension of the portion of the mounting hole 166 communicating with the pressure adjustment ensuring flow path 141 is 10% to 80% of the diameter of the portion accommodating hole 164, preferably 8% or more and 80% or less.
Further, an internal thread is formed on the wall of the screw hole 165, a corresponding external thread is formed on the outer peripheral surface of the connecting portion 1622, and the bearing member 162 is connected to the screw hole 165 by the thread of the connecting portion 1622. An inner hexagonal groove is formed in the axial end face of the tail 1623, and the inner hexagonal groove is fixed in a rotating way by a screwdriver during assembly.
Meanwhile, in order to ensure the tightness of the mounting hole 166, a sealing ring 1652 is sleeved on the connecting portion 1622. The threaded hole 165 has an inclined transition section 1651 near the side wall of the base 1, and when assembled, the seal ring 1652 is abutted against the space formed by the tail section 1623, the inclined transition section 1651 and the connecting section 1622 by rotating the tail section 1623, thereby isolating the mounting hole 166 from the outside and improving the tightness of the mounting hole 166.
Further, in order to facilitate the assembly of the pressure adjusting device 16, in the present embodiment, as shown in fig. 4 and 6, a protruding portion 103 is provided on the side wall of the base 1 corresponding to the mounting hole 166, the protruding portion 103 is integrally formed with the base 1, the mounting hole 166 is extended toward the side away from the overflow channel 163 and penetrates the protruding portion 103, and accordingly, the portion of the mounting hole penetrating the protruding portion 103 becomes the screw hole 165 or a part of the screw hole 165.
In addition, referring to fig. 6, a recess 104 is recessed in the base front 102 (i.e., an axial end surface connected to the transmission case) along the thickness direction of the base 1, and the oil inlet 11 and the oil outlet 12 protrude from the recess 104, and an end surface of the transmission case (not shown) thereof is formed in a shape corresponding to the base front 102. The base 1 is provided with a fixing hole for attaching a fastener such as a screw or a bolt, and the transmission (not shown) is provided with a positioning hole.
Fig. 7 shows another embodiment of the pressure regulating device of the present invention. The flow control device 16 includes a ball plunger 162', a relief valve 160, and a loading spring 161 located between the ball plunger 162' and the relief valve 160 and having opposite ends respectively abutting the ball plunger 162 'and the relief valve 160, the ball plunger 162' being mounted in a mounting hole 166. Specifically, ball plug 162 'is disposed in limiting hole 165, the aperture of receiving hole 164 is smaller than the aperture of limiting hole 165, transition is performed between limiting hole 165 and receiving hole 164 through inclined transition section 1651', the inclined surface of inclined transition section 1651 'is tangential to the spherical surface of ball plug 162', compared with the structure without inclined transition section 1621, the structure with inclined transition section 1621 can avoid crushing the step sharp angle formed between limiting hole 165 and receiving hole 164 when ball plug 162 'is mounted, thereby affecting the mounting position precision of ball plug 162', further affecting the preset loading pressure value of loading spring 161, and finally affecting the opening pressure of pressure regulating device 16. In this embodiment, the limiting hole 165 is a light hole, the ball plug 162 'is a steel ball, the ball plug 162' is in interference fit with the limiting hole 165, a sealing structure can be formed between the limiting hole 165 and the ball plug 162', and another sealing structure can be formed between the limiting hole 165 and the ball plug 162' by arranging the inclined transition section 1621. The inclination angle of the inclined transition section 1621 may be set at 20 ° to 70 °, preferably 40 ° to 50 °. Thus, the formation of a good seal structure can be ensured, and the accuracy of the mounting position of the ball plunger 162' can be ensured, and even if a seal ring is not provided between the ball plunger 162' and the stopper hole 165, the fluid in the housing hole 164 does not leak to the outside of the base 1 beyond the ball plunger 162 '. The invention utilizes the unthreaded combination of the limiting hole 165 and the steel ball 162' to realize the installation and sealing of the flow control device 16 in the installation hole 166, which not only has simple structure and less parts, but also has very simple installation process, and simultaneously, the unthreaded hole and the steel ball have simpler manufacturing process, thereby effectively reducing the manufacturing cost. In addition, the steel ball and the unthreaded hole are matched with a structure which occupies less space, so that the size of the base 1 can be obviously reduced, and the whole base 1 can be miniaturized and light.
Next, the operation of the base 1 in the motor oil pump 100 configured as described above will be described.
The assembled motor oil pump 100 is mounted on, for example, an automobile transmission in the direction shown in fig. 1, and the motor 3 is started.
The rotor assembly rotates in the chamber 23 of the pump body 2, and according to the change of the volume of the liquid between gears, an oil suction chamber 271 and an oil pressing chamber 281 are formed in the chamber 23 as shown in fig. 2, and at this time, as shown in fig. 1, the fluid is sucked into the base 1 from the oil inlet hole 11 and pumped out from the oil outlet hole 12.
When a part of the fluid in the oil pressure chamber 281 flows into the relief flow passage 163 after entering the oil outlet hole 12 and the pressure in the base plenum 15 does not exceed the predetermined pressure, the relief valve 160 seals the relief flow passage 163.
According to fig. 4, when the pressure in the base positive pressure chamber 15 exceeds a predetermined pressure, the relief fluid in the relief flow passage 163 pushes the relief valve 160 toward the carrier 162 against the biasing force of the biasing spring 161, the biasing spring 161 is compressed, and the fluid stored in the storage hole 164 is discharged into the negative pressure chamber concave portion 142 through the pressure adjustment ensuring flow passage 141, thereby freeing up a space for opening the relief valve 160, so that the relief valve 160 is smoothly opened to communicate the relief flow passage 163 with the base negative pressure chamber 14, and the relief fluid is discharged into the base negative pressure chamber 14 through the relief flow passage 163, thereby achieving the purpose of pressure relief. When the pressure in the base positive pressure chamber 15 falls back to the predetermined pressure, the relief valve 160 is returned by the restoring force of the loading spring 161, and the communication between the relief flow passage 163 and the base negative pressure chamber 14 is shut off, so that the pressure in the fluid working flow passage is maintained within the predetermined pressure.
In summary, the present invention has a simple structure to ensure the pressure adjusting function of the pressure adjusting device, effectively overcomes various disadvantages in the prior art, and has high industrial utility value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (6)
1. A base for a fluid pump (100), the base (1) having a base suction chamber (14),
The base (1) is provided with a mounting hole (166) for mounting the pressure regulating device (16), the mounting hole (166) comprises a receiving hole (164) and a threaded hole (165),
An overflow flow path (163) is arranged in the base (1), when the pressure regulating device (16) is arranged on the base (1) and is opened, the overflow flow path (163) is communicated with the base negative pressure chamber (14), and when the pressure regulating device (16) is closed, the communication between the overflow flow path (163) and the base negative pressure chamber (14) is cut off,
The base is characterized in that the base (1) further comprises a pressure regulation guarantee flow path (141), and when the pressure regulating device (16) is installed on the base (1) and opened, the pressure regulation guarantee flow path (141) communicates the containing hole (164) with the base negative pressure chamber (14);
The pressure regulating device (16) comprises a safety valve (160), the safety valve (160) is arranged close to the overflow flow path (163), and the extension length (l) of the pressure regulating guarantee flow path (141) along the direction parallel to the axial direction of the mounting hole (166) is larger than the axial length of the safety valve (160).
2. The base according to claim 1, characterized in that the pressure regulation ensuring flow path (141) extends from an axial end face of the base toward an axially inner side of the base.
3. The base according to claim 1 or 2, characterized in that, in terms of an axial direction of the base, a bottom of the pressure adjustment assurance flow path (141) communicates with the mounting hole (166).
4. A base according to claim 3, wherein the circumferential dimension of the portion of the mounting hole (166) communicating with the pressure adjustment ensuring flow path (141) is 8% to 80% of the aperture of the portion.
5. The base according to claim 1 or 2 or 4, characterized in that the pressure regulation ensuring flow path (141) is integrally formed with the base negative pressure chamber (14) at the time of the base (1) molding.
6. A fluid pump comprising a base according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910651786.6A CN110425314B (en) | 2019-07-18 | 2019-07-18 | Base and fluid pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910651786.6A CN110425314B (en) | 2019-07-18 | 2019-07-18 | Base and fluid pump |
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| CN110425314A CN110425314A (en) | 2019-11-08 |
| CN110425314B true CN110425314B (en) | 2024-10-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061152A (en) * | 2013-03-21 | 2014-09-24 | 株式会社捷太格特 | Pump |
| CN210920233U (en) * | 2019-07-18 | 2020-07-03 | 常州嵘驰发动机技术有限公司 | Base and fluid pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6113360A (en) * | 1998-07-27 | 2000-09-05 | Ford Motor Company | Gerotor pump |
| JP4888158B2 (en) * | 2007-02-28 | 2012-02-29 | 株式会社ジェイテクト | Electric pump unit and electric oil pump |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061152A (en) * | 2013-03-21 | 2014-09-24 | 株式会社捷太格特 | Pump |
| CN210920233U (en) * | 2019-07-18 | 2020-07-03 | 常州嵘驰发动机技术有限公司 | Base and fluid pump |
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