CN115750296A - Novel double-tube-shaped diaphragm metering pump hydraulic end - Google Patents

Abstract

The invention discloses a novel double-tube diaphragm metering pump hydraulic end. Including pump head, cylinder body, plunger, import device and exit device, the pump head on set up the cylinder body, set up the plunger in the cylinder body, import device and exit device set up entrance point and the exit end at the pump head respectively, exit device on set up diaphragm alarm device, the inside outer hose diaphragm and the interior hose diaphragm of setting up of pump head, gapped between outer hose diaphragm and the interior hose diaphragm. Through setting up the diaphragm into two hose diaphragm structures, make the concertina movement of hose diaphragm restricted at the minimum, ensure that the hose has longer life, through setting up hose diaphragm alarm device that breaks, monitor the condition of diaphragm at any time, the suggestion we shut down the inspection or change, the safety coefficient idea that makes leakage monitoring can be realized, through the check valve structure that sets up import device and outlet device, as long as relax and press the valve bolt, just can easily take out the check valve, need not dismantle whole pump head, and is convenient also swift.

Description

Liquid end of a new type of double-tubular diaphragm metering pump

technical field

The invention relates to the field of metering pumps, in particular to a fluid end of a novel double-tubular diaphragm metering pump.

Background technique

With the rapid development of slurry conveying equipment, due to the complex shape of the membrane cavity of the pump head and the direct contact between the medium and the membrane cavity of the pump head, the slurry conveyed is highly suspendable, viscous, abrasive and Containing solid particles, it is easy to accumulate in every corner of the membrane cavity, resulting in increased running resistance and increased clearance volume, which is not suitable for slurry transportation. However, the medium of the tubular diaphragm pump does not directly contact the membrane cavity of the pump head when it runs in the tubular diaphragm, and it is a linear flow channel, which does not have some shortcomings of the flat diaphragm pump for slurry delivery, so it has been more and more widely used. .

At present, the flat diaphragm on the market has the disadvantage of bad movement direction of coal slurry, the slurry has a tendency to settle in the diaphragm chamber, and the diaphragm is easy to wear. At the same time, in the process of conveying slurry, check valves often have problems such as jamming, wear, slow valve ball return, high failure rate, frequent disassembly, maintenance or replacement, etc., and the current check valve structure is troublesome to disassemble, and the workload Large, not conducive to the normal operation of the metering pump.

Contents of the invention

Aiming at the problems existing in the prior art, the object of the present invention is to provide a new liquid end of a double-tubular diaphragm metering pump.

In order to achieve the above purpose, the present invention provides the following technical solutions: a novel double-tubular diaphragm metering pump fluid end, including a pump head, a cylinder, an inlet device and an outlet device, a cylinder is arranged on one side of the pump head, and a column is arranged in the cylinder The plug, the inlet device and the outlet device are respectively arranged at the inlet end and the outlet end of the pump head, and it is characterized in that a double hose diaphragm is arranged in the pump head to form a medium channel.

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the inlet device includes a pressure-taking ring A, an inlet valve fixing seat, a one-way valve A, a pressure valve flange A, an inlet pipe and an inlet method. Lan, the lower end of the pump head is provided with a pressure-taking ring A, an inlet valve fixing seat, a one-way valve A, a pressure valve flange A, an inlet pipe and an inlet flange; the outlet device includes a pressure-taking ring B, an outlet Valve fixing seat, one-way valve B, pressure valve flange B, outlet pipe and outlet flange, the upper end of the pump head is provided with pressure-taking ring B, outlet valve fixing seat, one-way valve B, and pressure valve flange B in sequence , outlet pipe and outlet flange.

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the double-hose diaphragm is composed of an outer hose diaphragm and an inner hose diaphragm, and the outer hose diaphragm is arranged between the pump head and the pressure-taking ring A And between the pump head and the pressure-taking ring B, the inner hose diaphragm is set between the inlet valve fixing seat and the pressure-taking ring A and the outlet valve fixing seat and the pressure-taking ring B, and between the outer hose diaphragm and the inner hose diaphragm The set gap constitutes an alarm overflow channel, a liquid valve A is set on the pressure-taking ring A at one end of the alarm overflow channel, and an alarm device is set on the pressure-taking ring B at the other end of the alarm overflow channel.

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the check valve A includes a valve core A, a valve seat A and a valve sleeve A, the valve seat A is arranged above the inlet pipe, and the valve core A Set above the valve seat A, the valve sleeve A is pressed above the valve seat A and the valve core A can move up and down in the valve sleeve A; A sealing ring A is set on the conical surface of the core A, and a pressure plate A and a shaft retaining ring A are arranged in turn above the sealing ring A; a spring A is set on the valve core A, and the spring A is limited by the valve core A and the valve sleeve A between the valve seat A and the valve sleeve A, the valve pad A is set, the first gasket is set between the valve seat and the inlet pipe, and the second gasket is set between the valve sleeve and the inlet valve fixed seat .

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the one-way valve B includes a valve core B, a valve seat B and a valve sleeve B, and the valve seat B is arranged above the outlet valve fixing seat, and the valve The core B is set above the valve seat B, the valve sleeve B is pressed above the valve seat B and the valve core B can move up and down in the valve sleeve B; , the sealing ring B is set on the conical surface of the spool B, the pressure plate B and the shaft retaining ring B are set above the sealing ring B; the spring B is set on the spool B, and the spring B is limited by the spool B and the valve sleeve Between B; the valve seat B and the valve sleeve B are provided with a valve pad B, the third gasket is provided between the valve seat B and the outlet valve fixed seat, and the fourth seal is provided between the valve sleeve B and the outlet pipe pad.

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the alarm device includes an alarm seat, a one-way valve, a pressure gauge and a liquid valve B, and one end of the alarm seat is screwed to the pressure-taking ring B The fifth sealing gasket is set between the alarm seat and the pressure ring B, the other end of the alarm seat is screwed with a pressure gauge, the sixth sealing gasket is set between the pressure gauge and the alarm seat, and the one-way valve is set in the alarm seat. The liquid valve B is arranged on the channel of the alarm seat.

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the check valve is composed of a steel ball, a spring C and an adjusting spring screw, and the steel ball, spring C and adjusting spring screw are sequentially arranged from left to right Set in the alarm seat.

The hydraulic end of a novel double-tubular diaphragm metering pump is characterized in that the inlet valve fixing seat is provided with a semi-circular step, and the inner diameter of the semi-circular step matches the outer diameter of the valve sleeve.

The hydraulic end of the novel double-tubular diaphragm metering pump is characterized in that the outlet valve fixing seat is provided with a semi-circular step, and the inner diameter of the semi-circular step matches the outer diameter of the valve seat.

Compared with prior art, the beneficial effect of the present invention is:

1. According to the principle of bionics, the present invention sets the diaphragm as a double-hose diaphragm structure, and the transported medium only directly contacts with the inner hose diaphragm, and the medium and propulsion fluid (hydraulic oil) are separated by the double-hose diaphragm. The double-hose diaphragms automatically form a vacuum through the reciprocating operation of the plunger, and they fit together tightly, just like the single-hose diaphragms stretch and deform under the action of the plunger’s reciprocating movement. The destruction of the vacuum; the hose diaphragm provides the best performance state for the medium flowing in it. The movement of the hose diaphragm is similar to the arterial movement of the human body, so that the stretching movement of the hose diaphragm is limited to a minimum, ensuring that the hose has Long service life, the hose diaphragm provides the best performance state for the medium flowing in it; the hose diaphragm solves the shortcomings of the bad movement direction of the slurry due to the use of a flat diaphragm, and at the same time the slurry (with suspension, The medium with high viscosity, abrasiveness and solid particles) has a tendency to settle in the diaphragm chamber, and the diaphragm is easy to wear, and the flow pattern of the medium in the hose diaphragm creates the best operating conditions for the pump;

2. The present invention is equipped with a hose diaphragm rupture alarm device. Since the transported medium is suspending, highly viscous, abrasive and contains solid particles, the diaphragm chamber tends to settle during the transport of the medium, and the diaphragm is easy to wear; After damage, when the plunger enters the suction stroke, liquid (transmitted medium or hydraulic oil) enters the alarm overflow channel, and when the plunger is converted into the discharge stroke, the working pressure enters the alarm device, if the alarm device is local pressure If the gauge shows, the pressure gauge will then indicate the pressure of the process, and the pointer will swing, indicating that the diaphragm of the pump may be ruptured, prompting us to stop for inspection or replacement, so that the idea of a safety system for leakage monitoring can be realized; when a hose diaphragm In the case of rupture, the metering pump can still run, and there is no need to stop immediately, and the hose diaphragm can be replaced when the system is stopped;

3. Both the inlet device and the outlet device of the present invention adopt a one-way valve structure. As long as the pressure valve bolt is loosened, the one-way valve can be easily taken out for maintenance without disassembling the entire pump head; the one-way valve used in the inlet device and the outlet device The seal inside the valve adopts two kinds of soft and hard cone seals, which improves the sealing performance, and the valve core adopts spring-assisted reset to speed up the valve core return to seat speed.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the cross-sectional structure schematic diagram of Fig. 1;

Fig. 3 is the structural representation of outlet device;

Fig. 4 is the structural representation of warning device;

Fig. 5 is the structural representation of valve sleeve B;

Fig. 6 is a top view structural schematic diagram of valve sleeve B;

Fig. 7 is a top view structural diagram of the outlet valve fixing seat;

Fig. 8 is A-A sectional view among Fig. 7;

Fig. 9 is a schematic diagram of a check valve in an outlet device in the prior art;

In the figure: 1-inlet flange; 2-inlet pipe; 3-bolt A; 4-pressure valve flange A; 5-first gasket; 6-seat A; 7-valve pad A; 8-sealing Ring A; 9-press plate A; 10-shaft retaining ring A; 11-spool A; 12-screw A; 13-plunger; 14-sealing ring A; -Pump head; 18-Pressure ring B; 19-Outlet valve fixing seat; 20-Screw B; 21-Bolt B; 22-Pressure valve flange B; 23-Outlet pipe; 24-Outlet flange; Four gaskets; 26-spring B; 27-valve sleeve B; 28-spool B; 29-shaft retaining ring B; 30-press plate B; 31-sealing ring B; B; 34-third gasket; 35-liquid valve B; 36-pressure gauge; 37-sixth gasket; 38-adjusting spring screw; 39-alarm seat; 40-spring C; 41-steel ball; 42 -Fifth gasket; 43-Outer hose diaphragm; 44-Inner hose diaphragm; 45-Bolt C; 46-Liquid valve A; 47-Pressure ring A; 48-Inlet valve fixing seat; 49-Second Gasket; 50-valve sleeve A; 51-spring A; 52-semicircular step.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "another end" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific Azimuth configuration and operation, therefore, should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "set with", "connected", etc. should be understood in a broad sense, such as "connected", which may be a fixed connection , can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediary, and can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

A fluid end of a novel double-tubular diaphragm metering pump includes a pump head 17, a cylinder body 15, an inlet device and an outlet device. Set the cylinder body 15 on one side of the pump head 17, put the sealing ring B16 into the groove of the cylinder body 15, then fix the cylinder body 15 and the pump head 17 with bolts 45, tighten the bolts 45, and put the sealing ring A14 into the plunger In the groove of 13, plunger 13 is packed in the cylinder body 15 again, has just formed power end like this.

The inlet device and the outlet device are respectively arranged at the inlet end and the outlet end of the pump head 17 . The inlet device includes a pressure-taking ring A47, an inlet valve fixing seat 48, a check valve A, a pressure valve flange A4, an inlet pipe 2 and an inlet flange 1, and the lower end of the pump head 17 is provided with a pressure-taking ring A47 and an inlet valve fixing seat 48 in sequence. , one-way valve A, pressure valve flange A4, inlet pipe 2 and inlet flange 1, inlet valve fixing seat 48, pressure taking ring A47 are connected with the lower end of pump head 17 through screw A12. The lower end surface of the inlet valve fixing seat 48 is provided with a semi-circular step, and the inner diameter of the semi-circular step matches the outer diameter of the valve sleeve A50. Within the circular step, the installation position of the check valve A can be precisely positioned. One end of the inlet pipe 2 is welded with the inlet flange 1, and the other end of the inlet pipe 2 is connected with the inlet valve fixing seat 48 through the bolt A3, and the one-way valve A is installed between the inlet pipe 2 and the inlet valve fixing seat 48. When the inlet check valve A breaks down, as long as the bolt A3 is loosened, the check valve A can be easily taken out for maintenance without taking out the bolt A3, and the installation is also very easy and convenient.

The outlet device includes a pressure-taking ring B18, an outlet valve fixing seat 19, a one-way valve B, a pressure valve flange B22, an outlet pipe 23 and an outlet flange 24, and the upper end of the pump head 17 is sequentially provided with a pressure-taking ring B18 and an outlet valve fixing seat 19 , one-way valve B, pressure valve flange B22, outlet pipe 23 and outlet flange 24, outlet valve fixing seat 19, pressure taking ring B18 are connected with the upper end of pump head 17 through screw B20, and the upper end surface of outlet valve fixing seat 19 is set The semi-circular step 52, the inner diameter of the semi-circular step matches the outer diameter of the valve seat B33, when the valve seat B33 needs to be installed, it is only necessary to put the valve seat B33 into the semi-circular step 52 of the outlet valve fixing seat 19, that is It can accurately locate the installation position of check valve B. One end of the outlet pipe 23 is welded to the outlet flange 24 , the other end of the outlet pipe 23 is connected to the outlet valve fixing seat 19 through a bolt B21 , and the one-way valve B is installed between the outlet pipe 23 and the outlet valve fixing seat 19 . When the outlet check valve B breaks down, as long as the bolt B21 is loosened, the check valve B can be easily taken out for maintenance without taking out the bolt B21. At the same time, the installation is also very convenient and quick.

A double hose diaphragm is arranged in the pump head 17 to form a medium channel. The double hose diaphragm is composed of an outer hose diaphragm 43 and an inner hose diaphragm 44. The outer hose diaphragm 43 is arranged between the pump head 17 and the pressure-taking ring A47 and between the pump head 17 and the pressure-taking ring B18. The inner hose diaphragm 44 It is arranged between the inlet valve fixing seat 48 and the pressure-taking ring A47 and the outlet valve fixing seat 19 and the pressure-taking ring B18. The gap between the outer hose diaphragm 43 and the inner hose diaphragm 44 constitutes an alarm overflow channel, which is located in the alarm The pressure-taking ring A47 at one end of the overflow channel is provided with a liquid valve A46, and the pressure-taking ring B18 at the other end of the alarm overflow channel is provided with an alarm device.

The alarm device includes an alarm seat 39, a one-way valve, a pressure gauge 36 and a liquid valve B35. One end of the alarm seat 39 is screwed on the pressure-taking ring B18, and a fifth sealing gasket is arranged between the alarm seat 39 and the pressure-taking ring B18. 42. The other end of the alarm seat 39 is screw-connected with a pressure gauge 36, the sixth gasket 37 is set between the pressure gauge 36 and the alarm seat 39, the one-way valve is set in the alarm seat 39, and the liquid-through valve B35 is set in the on the channel. One-way valve is made up of steel ball 41, spring C40 and adjusting spring screw 38, and steel ball 41, spring C40 and adjusting spring screw 38 are arranged in the alarm seat 39 successively from left to right. The pressure gauge can also be replaced with other pressure display elements as required, such as pressure sensors, pressure switches, etc.

Check valve A includes valve core A11, valve seat A6 and valve sleeve A50, valve seat A6 is set above the inlet pipe 2, valve core A11 is set above valve seat A6, valve sleeve A50 is pressed above valve seat A6 and valve core A11 It can move up and down inside the valve sleeve A50; the lower end of the valve core A11 is set as a conical surface and matched with the inner side of the valve seat A6 to increase the sealing performance. The sealing ring A8 is set on the conical surface of the valve core A11, and the sealing ring A8 is made of wear-resistant rubber material , above the sealing ring A8, the pressure plate A9 and the shaft retaining ring A10 are set in sequence; the spring A51 is sleeved on the valve core A11, and the spring A51 is limited between the valve core A11 and the valve sleeve A50; the upper and lower ends of the valve seat A6 are set to accommodate The valve pad A7 and the groove of the first sealing pad 5, the valve pad A7 is located between the valve seat A6 and the valve sleeve A50, the first sealing pad 5 is located between the valve seat 6 and the inlet pipe 2, and the upper end surface of the valve sleeve A50 is set to accommodate The groove of the second gasket 49 , the second gasket 49 is located between the valve sleeve A50 and the inlet valve fixing seat 48 . The seal ring A8 and the valve seat A6 are soft seals, and the conical surface of the valve core A11 and the valve seat A6 are hard seals after matching, thus forming a soft and hard double seal, which improves the sealing performance and service life. At the same time, the spring A51 is used to assist the reset of the one-way valve spool A11, so as to speed up the reseating speed of the spool A11 and improve the sealing performance of the one-way valve A.

The one-way valve B includes a valve core B28, a valve seat B33 and a valve sleeve B27. The valve seat B33 is set above the outlet valve fixed seat 19, the valve core B28 is set above the valve seat B33, the valve sleeve B27 is pressed above the valve seat B33 and the valve The core B28 can move up and down in the valve sleeve B27; the lower end of the valve core B28 is set as a conical surface and matched with the inner side of the valve seat B33, and the sealing ring B31 is set on the conical surface of the valve core B28, and the sealing rings B31 are wear-resistant rubber respectively. A pressure plate B30 and a shaft retaining ring B29 are set above the ring B31; a spring B26 is sleeved on the valve core B28, and the spring B26 is limited between the valve core B28 and the valve sleeve B27; the upper and lower ends of the valve seat B33 are set to accommodate the valve pad B32 and the third The groove of the gasket 34, the valve gasket B32 is located between the valve seat B33 and the valve sleeve B27, the third gasket 34 is located between the valve seat 33 and the outlet valve fixing seat 19, and the upper end of the valve sleeve B27 is set to accommodate the fourth gasket 25, the fourth gasket 25 is located between the valve sleeve B27 and the outlet pipe 23. The sealing ring B31 and the valve seat B33 are soft seals, and the conical surface of the valve core B28 and the valve seat B33 are hard seals after matching, thus forming a double seal of soft and hard, which improves the sealing performance and service life. At the same time, the spring B26 is used to assist the reset of the one-way valve B spool B28, so as to speed up the reseating speed of the spool B28 and improve the sealing performance of the one-way valve B.

Install the liquid valve A46 on the pressure ring A47, do not tighten the liquid valve A46 first, unscrew the liquid valve B35, inject hydraulic oil from the hole where the liquid valve B35 is installed, when the hydraulic oil leaks from the liquid valve A46 , it shows that the gap between the outer hose diaphragm 43 and the inner hose diaphragm 44 has been filled with hydraulic oil, and then tighten the liquid valve A46 at this time.

When the metering pump is running, the hydraulic oil between the diaphragms of the double hoses will be discharged from the alarm device and emptied, a vacuum is formed between the diaphragms of the double hoses, and they fit together tightly, and then the liquid valve B35 is installed on the alarm seat 39 upper side, and tighten.

The metering pump converts the rotary motion into the reciprocating motion of the plunger 13 through the power end. The plunger 13 reciprocates in the cylinder 15 to discharge a large amount of hydraulic oil. The tube diaphragm 43 and the inner tube diaphragm 44 are deformed; when the plunger 13 moves backward, the volume of the membrane cavity increases, the pressure decreases, and a negative pressure is generated. Under the action of the inlet atmospheric pressure, the double-hose diaphragm returns to its original shape, that is Cylindrical; so that the medium flows from the bottom of the one-way valve A (suction port) into the inner hose diaphragm 44; when the plunger moves forward, the hydraulic oil squeezes the double hose diaphragm and discharges it through the contraction of the double hose diaphragm medium, thus forcing the medium to flow from check valve B to the system header.

When the plunger 13 moves forward, the hydraulic oil between the double-hose diaphragms enters the check valve of the alarm device under the action of power, and the double-hose diaphragms will automatically form a vacuum through the reciprocating operation of the plunger 13. The rupture of the diaphragm of the tube will naturally cause the destruction of the vacuum between the diaphragms of the double hoses, so when the plunger 13 shifts and moves backward, the internal pressure will naturally enter the alarm device, and the pressure gauge of the alarm device will indicate the pressure, and the pointer will swing, prompting Our double hose diaphragm may be ruptured, but if a hose diaphragm is ruptured during operation, the metering pump can still run, and there is no need to stop immediately, and the hose diaphragm can be replaced when the system is shut down to improve production quality and machine utilization.

Claims (9)

1. The utility model provides a novel two tubulose diaphragm measuring pump hydraulic end, includes pump head (17), cylinder body (15), imported device and exit device, and pump head (17) one side sets up cylinder body (15), sets up plunger (13) in cylinder body (15), and imported device and exit device set up respectively at the entrance point and the exit end of pump head (17), its characterized in that: a double-hose diaphragm is arranged in the pump head (17) to form a medium channel.

2. The novel double-barrelled diaphragm metering pump hydraulic end according to claim 1, characterized in that the inlet device comprises a pressure-taking ring A (47), an inlet valve fixing seat (48), a check valve A, a pressure valve flange A (4), an inlet pipe (2) and an inlet flange (1), wherein the pressure-taking ring A (47), the inlet valve fixing seat (48), the check valve A, the pressure valve flange A (4), the inlet pipe (2) and the inlet flange (1) are sequentially arranged at the lower end of the pump head (17); the outlet device include get clamping ring B (18), outlet valve fixing base (19), check valve B, press valve flange B (22), outlet pipe (23) and outlet flange (24), pump head (17) upper end set gradually get clamping ring B (18), outlet valve fixing base (19), check valve B, press valve flange B (22), outlet pipe (23) and outlet flange (24).

3. The novel double-tubular diaphragm metering pump fluid end according to claim 2, wherein the double-hose diaphragm is composed of an outer hose diaphragm (43) and an inner hose diaphragm (44), the outer hose diaphragm (43) is arranged between the pump head (17) and the pressure taking ring A (47) and between the pump head (17) and the pressure taking ring B (18), the inner hose diaphragm (44) is arranged between the inlet valve fixing seat (48) and the pressure taking ring A (47) and between the outlet valve fixing seat (19) and the pressure taking ring B (18), a gap arranged between the outer hose diaphragm (43) and the inner hose diaphragm (44) forms an alarm overflow channel, the pressure taking ring A (47) at one end of the alarm overflow channel is provided with a liquid through valve A (46), and the pressure taking ring B (18) at the other end of the alarm overflow channel is provided with an alarm device.

4. The novel double-tubular diaphragm metering pump hydraulic end according to claim 2, characterized in that the check valve A comprises a valve core A (11), a valve seat A (6) and a valve sleeve A (50), the valve seat A (6) is arranged above the inlet pipe (2), the valve core A (11) is arranged above the valve seat A (6), the valve sleeve A (50) is pressed above the valve seat A (6), and the valve core A (11) can move up and down in the valve sleeve A (50); the lower end of the valve core A (11) is set into a conical surface and matched ground with the inner side of the valve seat A (6), a sealing ring A (8) is arranged on the conical surface of the valve core A (11), and a pressing plate A (9) and a shaft check ring A (10) are sequentially arranged above the sealing ring A (8); the valve core A (11) is sleeved with a spring A (51), and the spring A (51) is limited between the valve core A (11) and the valve sleeve A (50); the valve is characterized in that a valve pad A (7) is arranged between the valve seat A (6) and the valve sleeve A (50), a first sealing gasket (5) is arranged between the valve seat (6) and the inlet pipe (2), and a second sealing gasket (49) is arranged between the valve sleeve (50) and the inlet valve fixing seat (48).

5. The novel double-tubular diaphragm metering pump hydraulic end according to claim 2, wherein the check valve B comprises a valve core B (28), a valve seat B (33) and a valve sleeve B (27), the valve seat B (33) is arranged above the outlet valve fixing seat (19), the valve core B (28) is arranged above the valve seat B (33), the valve sleeve B (27) is pressed above the valve seat B (33), and the valve core B (28) can move up and down in the valve sleeve B (27); the lower end of the valve core B (28) is set into a conical surface and matched with the inner side of the valve seat B (33), a sealing ring B (31) is arranged on the conical surface of the valve core B (28), and a pressing plate B (30) and a retaining ring B (29) for a shaft are arranged above the sealing ring B (31); the valve core B (28) is sleeved with a spring B (26), and the spring B (26) is limited between the valve core B (28) and a valve sleeve B (27); valve seat B (33) and valve barrel B (27) set up valve gasket B (32), set up third sealed pad (34) between valve seat (33) and outlet valve fixing base (19), valve barrel B (27) and outlet pipe (23) between set up fourth sealed pad (25).

6. The novel double-barrelled form diaphragm metering pump fluid end of claim 3, characterized in that alarm device include warning seat (39), check valve, manometer (36) and logical liquid valve B (35), warning seat (39) one end spiro union set up on getting pressure ring B (18), and set up fifth sealed pad (42) between warning seat (39) and getting pressure ring B (18), the warning seat (39) other end sets up manometer (36), set up sixth sealed pad (37) between manometer (36) and the warning seat (39), the check valve sets up in warning seat (39), logical liquid valve B (35) set up on the passageway of warning seat (39).

7. The novel double-tubular diaphragm metering pump fluid end according to claim 6, wherein the check valve is composed of a steel ball (41), a spring C (40) and a spring adjusting screw (38), and the steel ball (41), the spring C (40) and the spring adjusting screw (38) are sequentially arranged in the alarm seat (39) from left to right.

8. The novel hydraulic end of the double tubular diaphragm metering pump according to claim 4, wherein the inlet valve fixing seat (48) is provided with a semicircular step, and the inner diameter of the semicircular step is matched with the outer diameter of the valve sleeve A (50).

9. The novel hydraulic end of the double tubular diaphragm metering pump according to claim 5, wherein the outlet valve fixing seat (19) is provided with a semicircular step, and the inner diameter of the semicircular step is matched with the outer diameter of the valve seat B (33).

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