A pneumatic three-way stop valve for large diaphragm pumps

Abstract

A pneumatic three-way stop valve for a large diaphragm pump belongs to the technical field of industrial pumps. The present invention can automatically and accurately control the capacity of the hydraulic oil in the pump head by refueling or draining the oil without affecting the normal operation of the diaphragm pump. The signal is controlled together with the valve body structure to realize low-pressure external supply of hydraulic oil with three functions of three-way, one-way and cutoff. The present invention includes a valve plate, characterized in that the valve plate is provided with an oil pump pipeline with an oil pump pipe port, a refueling hole, and an oil drain hole, the refueling hole and the oil drain hole are both connected to the oil pump pipeline, a one-way valve is provided in conjunction with the refueling hole, a nozzle is provided in conjunction with the oil drain hole, a refueling valve is provided on the outside of the one-way valve, and an oil drain valve is provided on the outside of the nozzle, the refueling valve and the oil drain valve are both fixed on the valve plate, the refueling valve and the oil drain valve have the same structure, and the refueling valve and the oil drain valve are both provided with an oil pipe interface and an air pipe hole.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial pumps, and in particular relates to a pneumatic three-way stop valve for a large diaphragm pump. Background Art

[0002] The pump heads of large diaphragm pumps we know all need to be pre-filled with a certain amount of hydraulic oil, but the pre-filled hydraulic oil is prone to excessive or insufficient pre-filling, and the hydraulic oil will also be lost during the reciprocating motion of the piston. The optimal capacity of hydraulic oil is an important parameter for improving pumping efficiency. Too much or too little hydraulic oil filling will reduce pumping efficiency and even cause component damage.

[0003] In addition, large diaphragm pumps have high rated delivery pressures and high reciprocating motion frequencies, which cause large pressure fluctuations in the pump head and large pressure differences between the hydraulic oil in the pump head and the external hydraulic oil. The signal control valve alone lags behind the pressure difference change of the pump, which can easily cause the hydraulic oil in the pump head to flow back into the external hydraulic pipeline, making it impossible to achieve accurate quantitative measurement. If external hydraulic oil with a pressure higher than the rated delivery pressure is used, it is easy to cause the hydraulic oil in the pump head to be too high, reducing the pumping efficiency. Summary of the invention

[0004] The present invention is aimed at the above-mentioned problems, makes up for the shortcomings of the prior art, and provides a pneumatic three-way stop valve for a large diaphragm pump. The present invention can automatically and accurately control the capacity of the hydraulic oil in the pump head by adding or draining oil without affecting the normal operation of the diaphragm pump. The signal and the valve body structure are jointly controlled to realize low-pressure external supply of hydraulic oil with three functions of three-way, one-way and cut-off.

[0005] To achieve the above purpose, the present invention adopts the following technical solution.

[0006] The present invention provides a pneumatic three-way stop valve for a large diaphragm pump, comprising a valve plate, characterized in that the valve plate is provided with an oil pumping pipeline with an oil pumping pipe port, a filling hole, and an oil drain hole, the filling hole and the oil drain hole are both connected to the oil pumping pipeline, a one-way valve is provided in conjunction with the filling hole, a nozzle is provided in conjunction with the oil drain hole, a filling valve is provided outside the one-way valve, an oil drain valve is provided outside the nozzle, the filling valve and the oil drain valve are both fixed on the valve plate, the filling valve and the oil drain valve have the same structure, and the filling valve and the oil drain valve are both provided with an oil pipe interface and an air pipe hole.

[0007] Furthermore, the refueling valve and the oil drain valve both include a valve body, a valve cover is provided in conjunction with the valve body, the air pipe hole is provided on the valve cover and connected to the valve body, a bowl-shaped small diaphragm is provided between the valve cover and the valve body, a press cover is provided in conjunction with the bowl-shaped small diaphragm, the press cover is connected to a valve stem through a set screw, a first guide ring and a second guide ring are installed through the valve stem and in correspondence with the valve body, a large spring is provided between the first guide ring and the press cover, the large spring is sleeved outside the valve stem, an inner sealing O-ring, a sealing ring and an outer sealing O-ring are installed on the second guide ring, a positioning retaining ring is provided at the bottom end of the second guide ring, the positioning retaining ring and the bottom end of the valve body form an installation cavity, the oil pipe interface is connected to the installation cavity, the one-way valve is provided in the installation cavity of the refueling valve, the nozzle is provided in the installation cavity of the oil drain valve, the bottom end of the valve stem extends into the installation cavity and is provided with a non-metallic insert in conjunction with it.

[0008] Furthermore, the valve cover is detachably connected to the valve body via hexagon socket screws.

[0009] Furthermore, a non-metallic ring gasket is arranged between the bowl-shaped small diaphragm and the valve cover.

[0010] Furthermore, the upper surface of the one-way valve is arranged parallel to the lower surface of the non-metallic insert.

[0011] Furthermore, the one-way valve includes a one-way valve body, a one-way valve seat and a one-way valve core, the one-way valve core is movably arranged inside the one-way valve body, the top of the one-way valve body is provided with a spray hole connected to the one-way valve core, the center of the one-way valve core is provided with a blind hole, the one-way valve seat has a convex rod that cooperates and extends into the blind hole, the outer stop of the one-way valve seat corresponds to the inner stop of the one-way valve body, the center of the one-way valve seat is provided with a small-diameter oil discharge hole, the bottom outer ring of the one-way valve seat is provided with at least one oil through hole, the root of the convex rod is provided with a spring positioning boss, and a small spring is detachably provided to cooperate with the spring positioning boss, the small spring is sleeved on the outside of the one-way valve core, the upper part of the one-way valve core corresponds to the small spring, and a sealing block and a gasket are correspondingly provided between the upper part of the one-way valve core and the small spring.

[0012] Furthermore, the one-way valve body is also provided with an annular groove, in which a sealing O-ring is detachably provided.

[0013] Furthermore, the refueling valve is coaxially arranged with the one-way valve, and the oil drain valve is coaxially arranged with the nozzle.

[0014] Furthermore, the installation depths of the one-way valve and the nozzle both exceed the center axis of the oil pump pipeline.

[0015] Furthermore, the refueling valve and the drain valve are both provided with a muffler mounting hole, and a muffler is installed in the muffler mounting hole.

[0016] Beneficial effects of the present invention.

[0017] The signal control in the present invention is the first level of conditional control, the pressure difference between the hydraulic oil in the pump head and the external hydraulic oil is the second level of conditional control, and the oil filling and draining functions are integrated to form a three-way stop valve. The stable air source and the spring reset electromagnetic reversing valve constitute the first level of conditional control, and the pressure difference between the hydraulic oil in the pump head and the external low-pressure hydraulic oil and the one-way valve constitute the second level of conditional control. Without affecting the normal operating efficiency of the diaphragm pump, the capacity of the hydraulic oil in the pump head can be automatically and accurately controlled by filling or draining the oil, thereby reducing the probability of component damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Figure 1 It is an overall front cross-sectional view of the present invention.

[0020] Figure 2 It is a front cross-sectional view of the oil filling valve and the oil drain valve of the present invention.

[0021] Figure 3 It is a front cross-sectional view of the one-way valve of the present invention.

[0022] Figure 4 It is a schematic diagram of the working connection principle of the present invention.

[0023] Markings in the figure: 1 is the valve plate, 2 is the pump oil pipeline, 3 is the filling hole, 4 is the drain hole, 5 is the one-way valve, 6 is the nozzle, 7 is the filling valve, 8 is the drain valve, 9 is the oil pipe interface, 10 is the valve body, 11 is the valve cover, 12 is the air pipe hole, 13 is the bowl-shaped small diaphragm, 14 is the cover, 15 is the set screw, 16 is the valve stem, 17 is the first guide ring, 18 is the second guide ring, 19 is the large spring, 20 is the inner sealing O-ring, 21 is the sealing ring, 22 is the outer sealing O-ring, 23 is the positioning retaining ring, 24 is the installation cavity, 25 is the non-metallic insert, 26 is the hexagonal screw, 27 is the non-metallic 1 is a ring gasket, 28 is a one-way valve body, 29 is a one-way valve seat, 30 is a one-way valve core, 31 is a spray hole, 32 is a blind hole, 33 is a convex rod, 34 is a small diameter oil discharge through hole, 35 is an oil through hole, 36 is a spring positioning boss, 37 is a small spring, 38 is a sealing block, 39 is a gasket, 40 is a sealing O-ring, 41 is a muffler mounting hole, 42 is a muffler, 43 is an air source, 44 is a low-pressure hydraulic oil source, 45 is a hydraulic oil tank, 46 is a diaphragm pump, 47 is a refueling signal, 48 is an oil discharge signal, 49 is a refueling solenoid valve, 50 is an oil discharge solenoid valve, and 51 is a pump oil pipe port. DETAILED DESCRIPTION

[0024] As shown in Figures 1-3 , this embodiment includes a valve plate 1 , which is provided with an oil pumping pipeline 2 with an oil pumping pipe port 51 , a filling hole 3 , and an oil drain hole 4 . The oil pumping pipe port 51 is used to connect an external oil pump 46 . The filling hole 3 and the drain hole 4 are both connected to the pump oil pipeline 2, and a one-way valve 5 is provided in conjunction with the filling hole 3, and a nozzle 6 is provided in conjunction with the drain hole 4. A filling valve 7 is provided outside the one-way valve 5, and an oil drain valve 8 is provided outside the nozzle 6. The filling valve 7 and the oil drain valve 8 are both fixed on the valve plate 1, and the filling valve 7 and the oil drain valve 8 have the same structure. The filling valve 7 and the oil drain valve 8 are both provided with an oil pipe interface 9 and an air pipe hole 12. The oil pipe interface 9 of the filling valve 7 is used to connect to an external low-pressure hydraulic oil source 44, and the oil pipe interface 9 of the oil drain valve 8 is used to connect to an external hydraulic oil tank 45. The air pipe hole 12 of the filling valve 7 is used to be connected to an air pipe connected to an external filling solenoid valve 49, and the air pipe hole 12 of the oil drain valve 8 is used to be connected to an air pipe connected to an external oil drain solenoid valve 50.

[0025] The filling valve 7 and the drain valve 8 both include a valve body 10 , and a valve cover 11 is provided to cooperate with the valve body 10 . The valve cover 11 is detachably connected to the valve body 10 via a hexagon socket screw 26 .

[0026] The air pipe hole 12 is arranged on the valve cover 11 and connected to the valve body 10 . A bowl-shaped small diaphragm 13 is correspondingly arranged between the valve cover 11 and the valve body 10 . A non-metallic ring gasket 27 is also arranged between the bowl-shaped small diaphragm 13 and the valve cover 11 .

[0027] A push cover 14 is provided to match the bowl-shaped small diaphragm 13. The push cover 14 is connected to a valve stem 16 through a set screw 15. A first guide ring 17 and a second guide ring 18 are installed through the valve stem 16 and corresponding to the valve body 10. A large spring 19 is provided between the first guide ring 17 and the push cover 14. The large spring 19 is sleeved outside the valve stem 16. An inner sealing O-ring 20, a sealing ring 21 and an outer sealing O-ring 22 are installed on the second guide ring 18. A set screw 21 is provided at the bottom of the second guide ring 18. The positioning retaining ring 23 and the bottom end of the valve body 10 form an installation cavity 24, the oil pipe interface 9 is connected to the installation cavity 24, the one-way valve 5 is arranged in the installation cavity 24 of the filling valve 7, the nozzle 6 is arranged in the installation cavity 24 of the drain valve 8, the bottom end of the valve stem 16 extends into the installation cavity 24 and is cooperated with a non-metallic insert 25, the upper surface of the one-way valve 5 is arranged parallel to the lower surface of the non-metallic insert 25 to form a sealing end face, and at the same time limit the stroke of the valve stem 16.

[0028] The refueling valve 7 and the drain valve 8 are both provided with a muffler mounting hole 41 , in which a muffler 42 is mounted.

[0029] The one-way valve 5 includes a one-way valve body 28, a one-way valve seat 29 and a one-way valve core 30. The one-way valve core 30 is movably arranged inside the one-way valve body 28. The top of the one-way valve body 28 is provided with a spray hole 31 connected to the one-way valve core 31. The one-way valve body 28 is also provided with an annular groove, and a sealing O-ring 40 is detachably arranged in the annular groove.

[0030] A blind hole 32 is provided at the center of the one-way valve core 30, and the one-way valve seat 29 has a protruding rod 33 that cooperates and extends into the blind hole 32. The outer stop of the one-way valve seat 29 corresponds to the inner stop of the one-way valve body 28. A small-diameter oil discharge hole 34 is provided at the center of the one-way valve seat 29, and at least one oil through hole 35 is provided on the bottom outer ring of the one-way valve seat 29. A spring positioning boss 36 is provided at the root of the protruding rod 33, and a small spring 37 is detachably provided in conjunction with the spring positioning boss 36. The small spring 37 is sleeved on the outside of the one-way valve core 30, and the upper part of the one-way valve core 30 corresponds to the small spring 37. A sealing block 38 and a gasket 39 are correspondingly provided between the small springs 37 on the upper part of the one-way valve core 30.

[0031] The filling valve 7 is coaxially arranged with the one-way valve 5, and the drain valve 8 is coaxially arranged with the nozzle 6. The shape of the nozzle 6 is similar to that of the one-way valve 5. The center of the nozzle 6 is a straight oil port and is installed on the valve plate 1 through threads. The installation depth of the one-way valve 5 exceeds the center axis of the oil pump pipeline 2.

[0032] Connection of three-way stop valve to the outside.

[0033] like Figure 4As shown, the air pipe hole 12 of the refueling valve 7 is connected to the external refueling solenoid valve 49 through an air pipe, and the refueling solenoid valve 49 is also connected to the air source 43 and the PLC that controls the refueling signal 47. The air pipe hole 12 of the oil drain valve 8 is connected to the external oil drain solenoid valve 50 through an air pipe, and the oil drain solenoid valve 50 is also connected to the air source 43 and the PLC that controls the oil drain signal 48.

[0034] The oil pipe interface 9 of the filling valve 7 is connected to the external hydraulic oil tank 45 through a pipeline, the oil pipe interface 9 of the drain valve 8 is connected to the external low-pressure hydraulic oil source 44 through a pipeline, and the pump oil pipe port 51 of the valve plate 1 is connected to the pump head of the diaphragm pump 46.

[0035] Working principle.

[0036] The pneumatic three-way stop valve can realize the stop, one-way and three-way functions.

[0037] When the external detection element does not detect that the hydraulic oil in the pump head of the diaphragm pump 46 is excessive or insufficient, it is normal at this time, and the pneumatic three-way stop valve is in a closed stop state. The filling solenoid valve 49 and the draining solenoid valve 50 are both connected to the air source 43 under the action of the spring force, and the air cavity formed by the bowl-shaped small diaphragm 13 of the filling valve 7 and the valve cover 11 of the filling valve 7 is inflated, and the air cavity pressure is transmitted to the valve stem 16 of the filling valve 7; at the same time, the air cavity formed by the bowl-shaped small diaphragm 13 of the draining valve 8 and the valve cover 11 of the draining valve 8 is inflated, and the air cavity pressure is transmitted to the valve stem 16 of the draining valve 8. The bottom of the valve stem 16 of the filling valve 7 contacts the top of the one-way valve 5, and the bottom of the valve stem 16 of the draining valve 8 contacts the top of the nozzle 6, and the oil circuits for filling and draining are closed and in a stop state.

[0038] The cut-off function is now realized.

[0039] When the external detection element detects that the amount of hydraulic oil in the pump head of the diaphragm pump 46 is low, the refueling signal 47 is given through the PLC control, the electromagnet of the refueling solenoid valve 49 is energized and reversed, the refueling valve 7 is connected to the atmosphere to exhaust, and the bottom of the valve stem 16 of the refueling valve 7 is separated from the top of the one-way valve 5, so that the refueling oil circuit is opened. The pressure of the pump head of the diaphragm pump 46 fluctuates. During the slurry suction stroke, when the pressure in the pump head of the diaphragm pump 46 is lower than the pressure of the connected low-pressure hydraulic oil source 44, the one-way valve 5 opens to refuel. When the pressure in the pump head of the diaphragm pump 46 is higher than the pressure of the connected low-pressure hydraulic oil source 44, the one-way valve 5 closes to block the oil circuit until the refueling signal 47 disappears and the refueling valve 7 returns to normal cutoff.

[0040] When the external detection element detects that the hydraulic oil in the pump head of the diaphragm pump 46 exceeds the amount, the PLC control gives the oil release signal 48, the electromagnet of the oil release solenoid valve 50 is energized and reversed, the oil release valve 8 is connected to the atmosphere and exhausted, and the bottom of the valve stem 16 of the oil release valve 8 is separated from the top of the nozzle 6. The pressure of the pump head of the diaphragm pump 46 fluctuates, and the oil is released when the pressure of the pump head of the diaphragm pump 46 is higher than the connected hydraulic oil tank 45 (i.e., atmospheric pressure) during the slurry discharge stroke. Until the oil release signal 48 disappears, the oil release valve 8 returns to normal and is closed.

[0041] So far, the one-way function has been realized.

[0042] The pneumatic three-way stop valve is directly connected to the hydraulic oil in the pump head of the diaphragm pump through an oil pipe, and is connected or cut off with the oil pipe interface 9 of the filling valve 7 through the check valve 5 and the filling valve 7, and is connected or cut off with the oil pipe interface 9 of the drain valve 8 through the nozzle 6. State 1, the filling valve 7 and the drain valve 8 are all closed; state 2, the filling valve 7 is opened, the check valve 5 automatically switches, and the drain valve 8 is closed; state 3, the drain valve 8 is opened, and the filling valve 7 is closed.

[0043] So far, the three-way function has been realized.

[0044] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. A pneumatic three-way stop valve for a large diaphragm pump, comprising a valve plate (1), characterized in that: The valve plate (1) is provided with an oil pumping pipeline (2) with an oil pumping pipe port (51), a filling hole (3), and an oil drain hole (4); the filling hole (3) and the oil drain hole (4) are both in communication with the oil pumping pipeline (2); a one-way valve (5) is provided in cooperation with the filling hole (3); a nozzle (6) is provided in cooperation with the oil drain hole (4); a filling valve (7) is provided outside the one-way valve (5); an oil drain valve (8) is provided outside the nozzle (6); the filling valve (7) and the oil drain valve (8) are both fixed on the valve plate (1); the filling valve (7) and the oil drain valve (8) have the same structure; and the filling valve (7) and the oil drain valve (8) are both provided with an oil pipe interface (9) and an air pipe hole (12); The refueling valve (7) and the drain valve (8) both comprise a valve body (10), a valve cover (11) being arranged in cooperation with the valve body (10), the air pipe hole (12) being arranged on the valve cover (11) and connected to the inside of the valve body (10), a small bowl-shaped diaphragm (13) being arranged between the valve cover (11) and the valve body (10), a press cover (14) being arranged in cooperation with the small bowl-shaped diaphragm (13), the press cover (14) being connected to a valve stem (16) via a set screw (15), a first guide ring (17) and a second guide ring (18) being arranged passing through the valve stem (16) and corresponding to the valve body (10), a large spring (17) being arranged between the first guide ring (17) and the press cover (14) 9), the large spring (19) is sleeved outside the valve stem (16), the second guide ring (18) is installed with an inner sealing O-ring (20), a sealing ring (21) and an outer sealing O-ring (22), the bottom end of the second guide ring (18) is provided with a positioning retaining ring (23), the positioning retaining ring (23) and the bottom end of the valve body (10) form a mounting cavity (24), the oil pipe interface (9) is connected to the mounting cavity (24), the one-way valve (5) is arranged in the mounting cavity (24) of the filling valve (7), the nozzle (6) is arranged in the mounting cavity (24) of the drain valve (8), the bottom end of the valve stem (16) extends into the mounting cavity (24) and is matched with a non-metallic insert (25); The one-way valve (5) comprises a one-way valve body (28), a one-way valve seat (29) and a one-way valve core (30); the one-way valve core (30) is movably arranged in cooperation with the inside of the one-way valve body (28); a spray hole (31) connected to the one-way valve core (30) is arranged at the top of the one-way valve body (28); a blind hole (32) is arranged at the center of the one-way valve core (30); the one-way valve seat (29) has a protruding rod (33) which cooperates and extends into the blind hole (32); the outer stop of the one-way valve seat (29) corresponds to the inner stop of the one-way valve body (28); the one-way valve seat (29) is provided with a protruding rod (33) which extends into the blind hole (32); the outer stop of the one-way valve seat (29) corresponds to the inner stop of the one-way valve body (28); the one-way valve seat (30) is provided with a protruding rod (33) which cooperates and ... A small-diameter oil discharge hole (34) is provided at the center of the one-way valve core (29), at least one oil passage hole (35) is provided at the bottom outer ring of the one-way valve seat (29), a spring positioning boss (36) is provided at the root of the protruding rod (33), and a small spring (37) is detachably provided to cooperate with the spring positioning boss (36), the small spring (37) is sleeved on the outside of the one-way valve core (30), the upper part of the one-way valve core (30) corresponds to the small spring (37), and a sealing block (38) and a gasket (39) are correspondingly provided between the upper part of the one-way valve core (30) and the small spring (37).

2. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: The valve cover (11) and the valve body (10) are detachably connected via hexagon socket screws (26).

3. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: A non-metallic ring gasket (27) is also provided between the bowl-shaped small diaphragm (13) and the valve cover (11).

4. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: The upper surface of the one-way valve (5) is arranged parallel to the lower surface of the non-metallic insert (25).

5. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: The one-way valve body (28) is also provided with an annular groove, in which a sealing O-ring (40) is detachably provided.

6. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: The refueling valve (7) is coaxially arranged with the one-way valve (5), and the oil discharge valve (8) is coaxially arranged with the nozzle (6).

7. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: The installation depths of the one-way valve (5) and the nozzle (6) both exceed the central axis of the oil pump pipeline (2).

8. A pneumatic three-way stop valve for a large diaphragm pump according to claim 1, characterized in that: The refueling valve (7) and the drain valve (8) are both provided with a muffler (4) mounting hole (41), and a muffler (42) is mounted in the muffler mounting hole (41).

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