WO2019080698A1

WO2019080698A1 - Grease pump

Info

Publication number: WO2019080698A1
Application number: PCT/CN2018/108850
Authority: WO
Inventors: 赵大平; 刘新功; 刘章
Original assignee: 郑州奥特科技有限公司
Priority date: 2017-10-25
Filing date: 2018-09-29
Publication date: 2019-05-02
Also published as: CN109707983A; CN109707983B

Abstract

A grease pump, comprising a pump body (1), a driving mechanism and a plunger pair (2), and also comprising a reversing valve (4) and a lever mechanism (6), wherein a spool (7) of the reversing valve (4) is switched between valve positions under the driving of the swinging action of the lever mechanism (6), and an output rotating shaft (10) drives a dialing member (12) rotating therewith; when the output rotating shaft (10) is rotated in the forward and reverse directions, the forward and reverse directions of the dialing member (12) dials the lever mechanism (6) to cause the lever mechanism to reciprocatingly swing, thus enabling the reversing valve (4) to change the valve position; the pump body (1) is internally provided with an elastic structure (14); when the output rotating shaft (10) rotates in the forward or reverse direction, the dialing member (12) contacts the lever mechanism (6) and drives the spool (7) to move, and the elastic structure (14) is compressed; and when the spool (7) is switched to a corresponding valve position, the dialing member (12) and the lever mechanism (6) slide relative to each other, and the lever mechanism (6) resets due to the elastic force provided therefor by the elastic structure (14). The reversing power of the reversing valve (4) is derived from a driving member that drives the plunger pair (2) to move, and power is transmitted to the spool (7) of the reversing valve (4) by means of the cooperation of the lever mechanism (6) and the dialing member (12). The present invention is simple in structure and easy to use.

Description

Grease pump

Technical field

The invention relates to a grease pump for injecting lubricating grease into a bearing, and belongs to the field of grease lubrication.

Background technique

The centralized lubrication system has a wide range of applications in large-scale construction machinery, military machinery, long-distance automatic production lines, and outdoor work vehicles and machinery in alpine regions. Centralized lubrication systems typically use a grease pump to pump grease to the grease distributor, which in turn is delivered to each location to be lubricated by a grease distributor.

At present, a common grease pump is a plunger type grease pump, which specifically includes a fuel tank for storing lubricating grease, a driver, a plunger pair, and a pump body for mounting the aforementioned components; the suction port of the plunger pair is connected to the oil tank, and the driver The output shaft sleeve is provided with an eccentric wheel, and the plunger of the plunger pair abuts against the eccentric wheel rim along the radial direction of the output shaft. During operation, the output shaft of the drive is reversed, and the eccentric wheel is reversed, thereby driving the plunger of the plunger pair to reciprocate, so that the suction port of the plunger pair absorbs a certain amount of lubricating grease and passes through the plunger pair. The oil drain is delivered to the part to be lubricated. Wherein, the lubrication line communicating with the pressure discharge port of the plunger pair is provided with a reversing valve, the reversing valve is provided with at least two valve positions, and when it is located at the first valve position, the lubricating grease can be delivered to the portion to be lubricated. Often referred to as the pressurization phase, when it is in the second valve position, the remaining grease can be returned to the tank, commonly referred to as the pressure relief stage. Specifically, the reversing valve has an oil inlet port, a oil return port and at least one oil outlet port, wherein the oil inlet port is connected with the pressure discharge port of the plunger pair, and the oil return port is connected with the oil tank, and the oil outlet port Connected to the lubrication line. When the reversing valve is in the first valve position, the oil inlet port and the oil outlet port are electrically connected, so that the lubricating oil sucked by the plunger pair flows through the oil discharge port of the plunger pair, the oil inlet port of the reversing valve, and the oil outlet port. Lubricate the pipeline and then deliver it to the part to be lubricated; when the reversing valve is in the second valve position, the oil outlet and the oil return port are electrically connected, thereby lubricating the remaining lubricating grease in the pipeline through the oil outlet of the reversing valve, The return port flows back to the tank. At present, the grease pump adopts an electromagnetic reversing valve. Since the reversing valve is affected by the grease, the commutation resistance is large, and the electrically controlled reversing valve is prone to burnout. The hydraulically controlled reversing valve structure is too complicated. Larger size.

Summary of the invention

It is an object of the present invention to provide a mechanical grease pump which has a more compact overall structure and a small footprint.

In order to solve the above technical problems, the grease pump of the present invention includes a pump body, a drive mechanism with an output shaft, and at least one plunger pair driven by the drive mechanism, and further includes a reversing valve and a lever mechanism disposed in the pump body. The switching action of the spool of the reversing valve between the valve positions is driven by the swinging action of the lever mechanism, and the output rotating shaft drives the dialing member to rotate with the rotating shaft, and the output shaft rotates in the forward and reverse directions. The forward and reverse toggle lever mechanism causes the lever mechanism to swing back and forth to change the valve position of the reversing valve, and the pump body is respectively provided with an elastic structure on both sides of the lever mechanism, and the dialing is performed when the output shaft rotates in the forward or reverse direction. The moving member contacts the lever mechanism and drives the spool to act, and the elastic structure is compressed. When the spool is switched to the corresponding valve position, the dial member and the lever mechanism slide relative to each other and the elastic structure provides the lever mechanism with elastic force to make it Reset.

The grease pump of the invention replaces the solenoid valve of the prior art by using a mechanical reversing valve, and at the same time, the reversing valve is disposed in the casing, so that the overall structure is compact and the space is small; and the valve is also avoided. The problem of inconvenient layout is brought about. The reversing power of the reversing valve of the present invention is derived from a driving component that drives the plunger pair to act, and the power is transmitted to the spool of the reversing valve by the cooperation of the lever mechanism and the dialing member, and the positive and negative rotation of the output shaft can drive the spool The reciprocating movement inside the valve body enables the switching of the working position. Compared with electromagnetic reversing valves, mechanical reversing valve construction consumes less power and reduces costs.

When the elastic structure is selected, the elastic structure may be a compression spring whose axis is perpendicular to the lever mechanism.

Alternatively, the elastic structure may be a torsion spring when the elastic structure is selected.

Further, the reversing valve is a spool valve structure.

Further, the reversing valve is a two-position reversing valve.

Specifically, the two-position reversing valve is a four-way reversing valve. When the first position is in the first position, the first oil outlet of the two-position reversing valve is connected to the oil inlet of the two-position reversing valve, and the second is out. The oil port is connected to the drain port of the two-position reversing valve; when in the second valve position, the first oil outlet of the two-position reversing valve is connected to the drain port of the two-position reversing valve, and the second oil is discharged. The port conducts the oil inlet of the two-position reversing valve.

Alternatively, the two-position reversing valve is a three-way reversing valve, and when the reversing valve is in the first valve position, only the oil inlet is electrically connected to the oil outlet; when the reversing valve is in the second valve position The oil inlet, the oil outlet and the drain port are electrically connected to each other.

Still alternatively, the two-position reversing valve is a two-way switching valve.

On the basis of the above various technical solutions, it is possible to define at least two plunger pairs in the pump body, and the oil discharge ports of the plunger pairs are electrically connected to each other.

DRAWINGS

Figure 1 is a schematic view showing the structure of the first embodiment of the grease pump of the present invention;

Figure 2 is a schematic view showing the structure of the two-position reversing valve and the lever mechanism of Figure 1;

A-d in Fig. 3 respectively shows a schematic diagram of the spool being switched from the first valve position to the second valve position driven by the lever mechanism;

A-c in Fig. 4 respectively shows a schematic diagram of switching the spool from the second valve position to the first valve position under the driving of the lever mechanism;

Figure 5 is a schematic view showing the principle of the two-position reversing valve in the first embodiment of the grease pump;

Figure 6 is a schematic view showing the principle of the two-position reversing valve in the second embodiment of the grease pump;

Figure 7 is a schematic view showing the principle of the two-position reversing valve in the third embodiment of the grease pump;

Among them: pump body 1, plunger pair 2, fuel tank 3, two-position reversing valve 4, output port 5, lever mechanism 6, spool 7, eccentric 8, motor 9, output shaft 10, limit member 11, dial The moving member 12, the valve body 13, and the torsion spring 14.

Detailed ways

The core of the invention is to provide a grease pump which has a more compact overall structure and a small footprint. The present invention will be further described in detail below in conjunction with the drawings and embodiments.

Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic structural view of a grease pump according to a first embodiment, and FIG. 2 is a schematic structural view of the two-position reversing valve of FIG.

The first embodiment of the grease pump provided by the present invention comprises a pump body 1, at least one plunger pair 2 installed in the pump body 1, and a driving mechanism; wherein the oil suction port of the plunger pair 2 communicates with the oil tank 3; the driving mechanism can drive The plunger of the plunger pair 2 reciprocates to pump the grease in the oil tank 3 from the oil discharge port of the plunger pair 2. A two-way selector valve 4 is provided between the plunger pair 2 and an external line (a line connected to the grease pump for pumping the grease to the portion to be lubricated).

In this embodiment, the two-position reversing valve 4 is disposed on the pump body 1, and the oil inlet port communicates with the oil discharge port of the plunger pair 2, the oil return port communicates with the oil tank 3, and the oil outlet port communicates with the external pipeline. . The oil outlet of the two-way selector valve 4 is the output port 5 of the grease pump. The grease pump further includes a lever mechanism 6 that drives the spool 7 of the two-position selector valve 4 under the driving mechanism to switch between the first valve position and the second valve position to pressurize the grease pump Switch between phase and unloading phase. Among them, the pressurization phase refers to the stage in which the grease pump pumps the lubricating grease to the portion to be lubricated, and the unloading phase refers to the phase in which the remaining lubricating grease is returned to the fuel tank 3.

The grease pump provided by the present invention is disposed on the pump body 1 with the two-position switching valve 4 communicating with the oil discharge port of the plunger pair 2, and drives the spool 7 of the two-position switching valve 4 to switch position by the lever mechanism 6. Wherein, the lever mechanism 6 is driven by the existing driving mechanism that drives the plunger pair 2, and there is no need to separately provide the driving member; compared with the external valve in the prior art, the two-position reversing valve is used in the present embodiment. 4 Built-in in the pump body 1 makes the overall structure of the grease pump more compact, takes up less space, and also avoids the problems of inconvenience caused by the external placement of the reversing valve; in addition, in this solution, the position of the two-way reversing valve 4 The positional switching of the valve body 7 is realized by the mechanical lever mechanism 6 driving, and the mechanical type directional control valve is more reliable in commutation and takes up less space than the electromagnetic type directional control valve in the prior art.

In a specific solution, the driving mechanism includes a driver and an eccentric wheel 8. The motor 9 is described herein as a driver. It should be understood that the driver may be other structures. The output shaft 10 of the motor 9 can be reversed, and the eccentric 8 is fixed on the output shaft 10 of the motor 9 by a flat key; the plunger of the plunger pair 2 abuts against the eccentric 8 in the radial direction of the output shaft 10. rim. Specifically, the output shaft 10 can be configured as a two-stage coupling structure, wherein one segment is fixed in the motor 9 and the other segment is inserted into the eccentric wheel 8 to facilitate assembly; of course, in actual setting, the output shaft 10 is an integral segment. The structure is also feasible. In this manner, the eccentric wheel 8 is driven forward and reverse by the motor 9, so that the plunger of the plunger pair 2 reciprocates in the radial direction of the output shaft 10, thereby pumping out the grease in the oil tank 3.

The lever mechanism is a rod member, the first end is hinged on the valve body, and the valve core 7 is further provided with a long hole through which the lever mechanism 6 passes. The lever mechanism is rigid, and after assembly, under external force, The lever mechanism 6 is rotatable about its first end, and the lever mechanism 6 can drive the spool 7 to move during the rotation, thereby changing the position of the spool 7. In order to prevent the valve core 7 from moving excessively, the corresponding position on the valve body 13 is also provided with a limiting member 11 for limiting the position of the valve core 7. When the valve core 7 is moved into position, the restricted position member 11 stops, and the lever mechanism cannot continue to rotate. So that the spool 7 can be held at the corresponding valve position.

The output shaft 10 of the drive mechanism is provided with a dial member 12. When the dial member 12 is rotated by the motor 9, the dial member 12 can push the lever mechanism 6, thereby driving the lever mechanism 6. An elastic structure for resetting the lever mechanism is disposed on the valve body 13 of the two-position reversing valve 4 on both sides of the lever mechanism 6. The elastic structure is a torsion spring 14, and one working end of the torsion spring 14 is fixed on the valve body, and One end is elastically pressed with the lever mechanism. Of course, in other embodiments, the toggle member can be disposed on the eccentric.

Of course, in other embodiments, the elastic structure may be a compression spring whose axis is perpendicular to the lever mechanism. One working end of the compression spring is fixed on the valve body, and the other end is elastically pressed against the lever mechanism, as shown in FIG. 3-4. .

FIG. 3 shows a schematic view of the positions of the spool from the first valve position to the second valve position driven by the lever mechanism. When the motor 9 drives the output shaft 10 to rotate forward (ie, rotate counterclockwise), the dial member 12 disposed thereon rotates forwardly and contacts the free end of the lever mechanism 6, as shown in FIG. 3a, the dial member When the rotation continues, the dial member 12 pushes the lever mechanism 6 to rotate, and in the process, the spool 7 is moved to switch from the first valve position to the second valve position.

When the lever mechanism 6 is in contact with the torsion spring 14, as shown in FIG. 3b, the dial member 12 is still rotated with the lever mechanism 6, and the dial member 12 is further rotated to push the lever mechanism 6 to continue to rotate against the spring force, when the spool 7 is switched to When the second valve position is stopped by the corresponding limit member 11, the valve core 7 stops moving as shown in Fig. 3c, and accordingly, the rotation of the lever mechanism 6 is also restricted, and at this time, the dial member 12 passes over and disengages from the lever mechanism 6. When the dial member 12 is continuously operated clockwise or counterclockwise, the movement relationship between the dial member 12 and the lever mechanism 6 continues, that is, the dial member 12 continues. The two-way reversing valve does not reverse direction beyond the lever mechanism. After the dial member 12 is disengaged from the lever mechanism 6, the lever mechanism 6 is reset by the action of the torsion spring 14, as shown in Fig. 4a, that is, the lever mechanism 6 is returned to the movement track of the dial member 12, so that the dial member 12 is reversed. When turning, the lever mechanism 6 can still be touched and pushed. At this time, the dial member 12 drives the lever mechanism to rotate and drives the two-position reversing valve to reverse.

It should be understood that since the lever mechanism 6 does not move, the restriction of the spool 7 by the positional member 11 cannot be moved, so that the spool 7 can be held at the second valve position. In this embodiment, the spool is set to a fixed moving stroke, and stops when the spool moves to the maximum stroke. The range of rotation of the lever mechanism is designed according to the movement stroke of the spool.

Figure 4 shows a schematic view of the position of the spool 7 being switched from the second valve position to the first valve position under the drive of the lever mechanism. When the motor 9 drives the output shaft 10 to rotate in a clockwise direction, the dial member 12 disposed thereon is reversed and contacts the lever mechanism 6. When the output shaft 10 continues to rotate, the lever mechanism 6 is further pushed against the spring. The force continues to rotate. When the spool 7 is switched to the second valve position, it is stopped by the corresponding limiting member 11, and the spool 7 stops moving. Accordingly, the rotation of the lever mechanism 6 is also restricted. The moving member 12 passes over and disengages from the lever mechanism 6. When the dial member 12 is continuously operated clockwise or counterclockwise, the movement relationship between the dial member 12 and the lever mechanism 6 continues, that is, the dial member 12 Will continue to cross the lever mechanism 6, the two-way reversing valve will not reverse direction. After the dial member 12 is disengaged from the lever mechanism 6, the lever mechanism 6 is reset by the action of the torsion spring, that is, the lever mechanism 6 returns to the movement track of the dial member 12, so that when the dial member 12 is reversed, it can still contact and Pushing the lever mechanism 6, at this time, the dial member drives the lever mechanism to rotate and drives the reversing valve to reverse.

Specifically, a roller may be provided at a portion of the dial member 12 that is in contact with the lever mechanism to reduce wear of the dial member 12.

On this basis, the grease pump can be provided with a plurality of plunger pairs 2 to meet the requirements of different lubricating grease pumping amounts; when the plunger pair 2 has more than two, the oil discharge ports of the plunger pairs 2 are electrically connected to each other. At this time, the oil inlet of the two-way selector valve 4 only needs to communicate with the oil discharge port of any of the plunger pairs 2.

Further, a relief valve that is electrically connected to the oil tank 3 may be provided at the oil discharge port of the plunger pair 2, and a safety valve may be provided.

On the basis of the above embodiments, the oil outlet of the two-way selector valve 4 may be provided by only one or two.

Referring to FIG. 5, FIG. 5 is a schematic diagram showing the principle of the two-position reversing valve in the first embodiment of the grease pump. In this solution, the two-way reversing valve 4 is provided with two oil outlets A and B. At this time, the two-position reversing valve 4 is a two-position four-way valve. Specifically, when the two-position reversing valve 4 is in the first valve position, the oil inlet port only conducts the oil outlet port A, the oil outlet port B only opens the oil return port, and the two-position reversing valve 4 is located at the second valve position. In the valve position, the oil inlet port only conducts the oil outlet B, and the oil outlet port A only conducts the oil return port.

In this way, two external pipes can be provided, which are respectively connected with the oil outlets A and B. During operation, the two external pipelines are alternately pressurized and unloaded when the reversing valves are at different valve positions. In a specific solution, a two-wire distributor connected to the oil outlets A and B may be disposed, and the lubricating grease is distributed to the portion to be lubricated by the two-wire distributor.

Referring to FIG. 6, FIG. 6 is a schematic diagram showing the principle of the two-position reversing valve in the second embodiment of the grease pump. In this solution, the two-way reversing valve 4 is only provided with one oil outlet C. At this time, the two-position reversing valve 4 is a two-position three-way valve. When the two-position reversing valve 4 is in the first valve position, the oil inlet port is only electrically connected to the oil outlet C, and when the two-position reversing valve 4 is in the second valve position, the oil discharge port, the oil inlet port and the oil outlet are provided. Port C is conductive to each other.

In this way, only one external pipe is provided, which is connected with the oil outlet C. When working, the external pipeline serves as both a pipeline for pumping lubricating grease and a conduit for excess lubricating grease to return. In a specific solution, a single-line distributor connected to the oil outlet C may be provided, and the lubricating grease is distributed to the portion to be lubricated by the single-line distributor.

Referring to Figure 7, Figure 7 shows a schematic diagram of the two-position reversing valve in the third embodiment of the grease pump. In this solution, the two-way reversing valve 4 is only provided with one oil outlet D. At this time, the two-position reversing valve 4 is a two-position three-way valve. When the two-position reversing valve 4 is in the first valve position, the oil inlet port is only electrically connected to the oil outlet port D, and when the two-position reversing valve 4 is in the second valve position, the oil return port is only guided to the oil outlet port D. through.

In this way, only one external pipe is provided, which is in communication with the oil outlet D. When working, the external pipeline serves as both a pipeline for pumping lubricating grease and a conduit for excess lubricating grease to return. In a specific solution, a single-line distributor connected to the oil outlet D may be disposed, and the lubricating grease is distributed to the portion to be lubricated by the single-line distributor.

In addition, in the specific setting, four channels can be opened on the two-way directional control valve 4, that is, it has one oil inlet port, one oil return port and two oil outlet ports, and when applicable, one of them can be blocked according to actual occasions. The oil outlet is operated as a two-position three-way valve, and it can be used as a two-position four-way valve. Therefore, the application is flexible and does not need to be specially designed for different occasions.

The two-way reversing valve 4 can be configured as a spool valve structure or as a rotary valve structure. When the reversing valve adopts the rotary valve structure, the structure of the lever mechanism needs to be adaptively changed. The position of the rotary valve is reversed by 90 degrees with respect to the spool valve in the above embodiment, and the corresponding rotary handle is disposed on the spool 7. The turning handle is connected to the fulcrum position of the lever mechanism 6, or it can also be connected to the hinged position of the lever mechanism 6 hinged to the spool 7. Or in other embodiments, the reversing valve may even be a three-position four-way valve having three stations in its travel stroke.

In other embodiments, the lever mechanism is also combined, including an elastic member formed by a spring clip, and the dial member also uses an elastic dial member, as long as the rigidity of the combined lever and the stiffness value of the elastic dial member are adapted. , can meet the limited resistance transmission.

It should be further noted that, in the above various embodiments, the output shaft can be rotated continuously in the forward direction and then reversely rotated indefinitely, or the forward and reverse rotations can be less than one complete turn, only in the rotation stroke. The lever mechanism can be used. The output shaft can be stopped for a period of time after the forward rotation of the indeterminate number of turns, and reversed when the action is required. When the forward and reverse rotation strokes are less than one full turn, it can stay for a period of time when the forward rotation is to the extreme position, and can be reversely rotated and reversely dialed when the action is required.

The grease pump provided by the present invention has been described in detail above. The principles and embodiments of the present invention have been described herein with reference to specific examples, and the description of the above embodiments is only to assist in understanding the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims

A grease pump comprising a pump body, a drive mechanism with an output shaft, and at least one plunger pair driven by the drive mechanism, further comprising a reversing valve and a lever mechanism disposed in the pump body, the change The switching action of the valve core of the valve between the valve positions is driven by the swinging action of the lever mechanism, and the output rotating shaft drives the dialing member with the rotation of the valve shaft. When the output shaft rotates in the forward and reverse directions, the dialing member is reversed. To the toggle lever mechanism, the lever mechanism is reciprocally oscillated to change the valve position of the reversing valve, and the pump body is respectively provided with an elastic structure on both sides of the lever mechanism, and when the output shaft rotates in the forward or reverse direction, the dial member is The lever mechanism contacts and drives the spool to act, and the elastic structure is compressed. When the spool is switched to the corresponding valve position, the dial member and the lever mechanism slide relative to each other and the elastic structure provides the lever mechanism with elastic force to reset it.
A grease pump according to claim 1, wherein said elastic structure is a compression spring whose axis is perpendicular to the lever mechanism.
A grease pump according to claim 1, wherein said elastic structure is a torsion spring.
A grease pump according to claim 1 or 2 or 3, wherein the reversing valve is a spool valve structure.
A grease pump according to claim 1 or 2 or 3, wherein the directional control valve is a two-position directional control valve.
The grease pump according to claim 5, wherein the two-position reversing valve is a four-way reversing valve, and when the first position is in the first position, the first oil outlet of the two-position reversing valve is turned on. The oil inlet of the reversing valve, the second oil outlet opens the drain port of the two-way reversing valve; when in the second valve position, the first oil outlet of the two-way reversing valve is turned into two positions To the drain port of the valve, the second oil outlet opens the oil inlet of the two-way selector valve.
The grease pump according to claim 5, wherein the two-position reversing valve is a three-way reversing valve, and when the reversing valve is in the first valve position, only the oil inlet port and the oil outlet port are When the reversing valve is in the second valve position, the oil inlet, the oil outlet and the drain port are electrically connected to each other.
A grease pump according to claim 5, wherein said two-position reversing valve is a two-way switching valve.
A grease pump according to claim 1 or 2 or 3, wherein there are at least two plunger pairs in the pump body, and the oil discharge ports of the plunger pairs are electrically connected to each other.