Hydraulic diaphragm metering pump with built-in automatic exhaust valve

Abstract

The utility model discloses a hydraulic diaphragm metering pump with a built-in automatic exhaust valve. The hydraulic diaphragm metering pump comprises a pump head, a mounting base, a pump body and an exhaust valve assembly, the pump head is fixed to the power output end of the pump body through a mounting base. And a movable chamber is arranged between the pump head and the mounting base. The exhaust valve assembly is installed on the installation base, and an air guide channel is arranged between the exhaust valve assembly and the movable cavity. The first valve ball and the second valve ball are arranged at the two ends of the exhaust valve support respectively. The second valve ball can seal an outlet of the air guide channel under the action of the reset elastic piece, the outside and a pump body pipeline are separated through the buffer channel, sectional exhaust of the pump body is achieved under the action of the first valve ball and the second valve ball, and the situation that dust exists in the pump body due to the fact that outside air with dust stays on the outer ring of the first valve ball is greatly reduced. Therefore, the purpose of prolonging the service life of the diaphragm pump is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of metering pump technology, specifically relating to a hydraulic diaphragm metering pump with a built-in automatic exhaust valve. Background Technology

[0002] A diaphragm pump is a common type of pump. The diaphragm is a crucial component, with one side containing the hydraulic oil chamber and the other side containing the medium chamber. The diaphragm pump operates by the reciprocating motion of a piston on the hydraulic oil chamber side, moving the diaphragm forward or backward. This, in turn, causes the inlet and outlet valves on the hydraulic end of the diaphragm to open and close alternately, achieving reciprocating fluid intake and discharge, thus enabling medium transport. An vent valve is installed on the hydraulic oil chamber of the diaphragm pump, automatically releasing any gas present.

[0003] Chinese patent publication number "CN210637557U" discloses an automatic exhaust valve and an exhaust valve assembly for a diaphragm pump, including a valve body with a self-exhausting channel; the self-exhausting channel in the valve body includes a variable diameter channel and a bypass channel; a valve core is provided in the large end, and an air storage gap is maintained between the valve core and the inner wall of the large end; a return spring is provided in the small end; when the return spring is in a compressed state, it presses the valve core against the small end.

[0004] The aforementioned patent achieves automatic venting of the diaphragm pump by using the cooperation of the valve core and the return spring to open or close the venting channel. However, when no venting is performed, dusty gas from the outside will remain on the outer ring of the valve core through the pipe. During the automatic venting and reset process of the valve core, the dust remaining in the pipe can easily be carried into the pump body's pipes, thereby increasing the wear rate of the plunger in the pump body during later operation. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, this utility model provides a hydraulic diaphragm metering pump with a built-in automatic exhaust valve to solve the technical problem that the exhaust valve of the diaphragm pump is prone to introducing external dusty gas after exhausting.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0007] A hydraulic diaphragm metering pump with a built-in automatic vent valve includes a pump head, a mounting base, a pump body, and a vent valve assembly. The pump head is fixed to the power output end of the pump body via the mounting base. A movable chamber is provided between the pump head and the mounting base. The vent valve assembly is mounted on the mounting base and has an air guide channel between it and the movable chamber.

[0008] The exhaust valve assembly includes an exhaust valve support, a reset elastic element, a first valve ball, and a second valve ball. The exhaust valve support is fixed to a mounting base and has a buffer channel communicating with the air guide channel. The first and second valve balls are respectively installed at both ends of the buffer channel. The first valve ball can close the outlet of the buffer channel under the action of gravity. The second valve ball can close the outlet of the air guide channel under the action of the reset elastic element.

[0009] Furthermore, the bottom of the exhaust valve support is provided with a mounting groove. A limiting support is installed in the mounting groove. A transition channel connecting the air guide channel and the buffer channel is provided on the limiting support. The transition channel is divided into a bottom transition section and a top guiding section. The opening size of the guiding section is larger than that of the transition section.

[0010] Furthermore, the exhaust valve support is divided into a first support at the top and a second support at the bottom. The bottom of the first support is fitted onto the second support, and its inner cavity has a limiting groove that mates with the first valve ball. The diameter of the limiting groove is larger than the diameter of the buffer channel.

[0011] Furthermore, the first support and the mounting base are respectively provided with a first exhaust channel and a second exhaust channel that are interconnected. The bottom of the first exhaust channel is connected to the limiting groove.

[0012] Furthermore, the reset elastic element is a spring.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] This invention features a first valve ball and a second valve ball at each end of the exhaust valve support. The first valve ball seals the outlet of the buffer channel under gravity. The second valve ball seals the outlet of the air guide channel under the action of a reset elastic element. The buffer channel separates the external environment from the pump body piping. The combined action of the first and second valve balls enables segmented exhaust from the pump body, significantly reducing the probability of dusty gas being introduced into the pump body during exhaust due to dusty gas remaining on the outer ring of the first valve ball. This extends the service life of the diaphragm pump. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram showing the relative positions of the exhaust valve assembly on the mounting base in this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the exhaust valve assembly in this utility model. Figure 2 (Enlarged view of part A in the middle)

[0018] Figure 4 This is a schematic diagram of the structure of the exhaust valve support in this utility model. Figure 3 (Enlarged view of part B in the middle section).

[0019] Reference numerals: 1. Pump head; 2. Mounting base; 3. Pump body; 4. Exhaust valve assembly; 5. Air guide channel; 6. Exhaust valve support; 6-1. First support; 6-2. Second support; 7. Reset elastic element; 8. First valve ball; 9. Second valve ball; 10. Buffer channel; 11. Limiting support; 12. Transition channel; 12-1. Transition part; 12-2. Conducting part; 13. Limiting groove; 14. First exhaust channel; 15. Second exhaust channel. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper side", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] like Figure 1 and 2 As shown, a hydraulic diaphragm metering pump with a built-in automatic vent valve includes a pump head 1, a mounting base 2, a pump body 3, and a vent valve assembly 4. The pump head 1 is fixed to the power output end of the pump body 3 via the mounting base 2. A movable chamber is provided between the pump head 1 and the mounting base 2. A diaphragm is installed in the movable chamber, which can perform suction and blowdown operations under the drive of a plunger in the pump body 3.

[0023] The exhaust valve assembly 4 is mounted on the mounting base 2, and an air guide channel 5 is provided between it and the movable chamber. The air bubbles generated by the plunger in the pump body 3 during long-term operation of hydraulic oil will be transported to the exhaust valve assembly 4 through the air guide channel 5 for discharge.

[0024] like Figure 2 and 3As shown, the exhaust valve assembly 4 includes an exhaust valve support 6, a reset elastic element 7, a first valve ball 8, and a second valve ball 9. The exhaust valve support 6 is fixed on the mounting base 2 and has a buffer channel 10 communicating with the air guide channel 5. The first valve ball 8 and the second valve ball 9 are respectively installed at both ends of the buffer channel 10. The first valve ball 8 can close the outlet at the top of the buffer channel 10 under the action of gravity. The second valve ball 9 can close the outlet of the air guide channel 5 under the action of the reset elastic element 7.

[0025] During operation, initially, the first valve ball 8 and the second valve ball 9 respectively block the buffer channel 10 and the air guide channel 5. When the plunger in the pump body 3 generates bubbles due to the continuous operation of the hydraulic oil, the bubbles will pass through the air guide channel 5 and accumulate at its opening. The accumulated gas gradually raises the second valve ball 9 blocking the opening of the air guide channel 5, allowing the gas to be discharged to enter the buffer channel 10 for temporary storage. Simultaneously, the second valve ball 9, due to the discharge of gas from the air guide channel 5, re-blocks the opening of the air guide channel 5 under the action of the reset elastic element 7. As the buffer channel 10 is continuously filled with gas, the first valve ball 8 will gradually rise, allowing the gas in the buffer channel 10 to be discharged from the opening at the top of the buffer channel 10. The arrangement of the first valve ball 8 and the second valve ball 9 effectively prevents external gas from entering the pump body 3, avoiding damage to the pump body 3.

[0026] In this embodiment, the reset elastic element 7 is a spring. The spring provides an outward elastic force to the second valve ball 9, so that when the gas guide channel 5 completes the gas discharge, the second valve ball 9 can block the opening of the gas guide channel 5 under the action of the spring, preventing external gas from entering the pump body 3.

[0027] Furthermore, such as Figure 4 As shown, the bottom of the exhaust valve support 6 has a mounting groove. A limiting support 11 is installed in the mounting groove. A transition channel 12 connecting the air guide channel 5 and the buffer channel 10 is provided on the limiting support 11. The transition channel 12 is divided into a bottom transition section 12-1 and a top guiding section 12-2. The opening size of the guiding section 12-2 is larger than that of the transition section 12-1.

[0028] In the initial state, the second valve ball 9 blocks the transition section 12-1 under the action of the reset elastic member 7. When the gas in the gas guide channel 5 gradually accumulates and raises the second valve ball 9, the second valve ball 9 is located in the center of the conduction section 12-2, so that the gas can flow smoothly through the transition section 12-1 and the conduction section 12-2 and enter the buffer channel 10.

[0029] like Figure 3 and 4As shown, the exhaust valve support 6 is divided into a first support 6-1 at the top and a second support 6-2 at the bottom. The bottom of the first support 6-1 is fitted onto the second support 6-2, and its inner cavity has a limiting channel 13 that mates with the first valve ball 8. The diameter of the limiting channel 13 is larger than the diameter of the buffer channel 10, allowing the gas accumulated in the buffer channel 10 to be smoothly discharged from the opening of the limiting channel 13 while simultaneously limiting the position of the first valve ball 8 when it is raised.

[0030] In this embodiment, the first support 6-1 and the mounting base 2 are respectively provided with a first exhaust channel 14 and a second exhaust channel 15 that are interconnected. The bottom of the first exhaust channel 14 is connected to the limiting groove 13. Gas discharged from the buffer channel 10 is discharged to the outside through the limiting groove 13, the first exhaust channel 14 and the second exhaust channel 15.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hydraulic diaphragm metering pump with a built-in automatic exhaust valve, comprising a pump head (1), a mounting base (2), and a pump body (3); the pump head (1) is fixed to the power output end of the pump body (3) via the mounting base (2); a movable chamber is provided between the pump head (1) and the mounting base (2), characterized in that: It also includes an exhaust valve assembly (4), which is mounted on the mounting base (2) and has an air guide channel (5) between it and the movable chamber. The exhaust valve assembly (4) includes an exhaust valve support (6), a reset elastic element (7), a first valve ball (8), and a second valve ball (9); the exhaust valve support (6) is fixed on the mounting base (2) and has a buffer channel (10) that communicates with the air guide channel (5); the first valve ball (8) and the second valve ball (9) are respectively installed at both ends of the buffer channel (10); the first valve ball (8) can close the outlet of the buffer channel (10) under the action of gravity; the second valve ball (9) can close the outlet of the air guide channel (5) under the action of the reset elastic element (7).

2. A hydraulic diaphragm metering pump with a built-in automatic venting valve according to claim 1, characterized in that: The bottom of the exhaust valve support (6) is provided with an installation groove; a limit support (11) is provided in the installation groove; a transition channel (12) connecting the air guide channel (5) and the buffer channel (10) is provided on the limit support (11); the transition channel (12) is divided into a bottom transition part (12-1) and a top guide part (12-2); the opening size of the guide part (12-2) is larger than that of the transition part (12-1).

3. A hydraulic diaphragm metering pump with a built-in automatic venting valve according to claim 1, characterized in that: The exhaust valve support (6) is divided into a first support (6-1) at the top and a second support (6-2) at the bottom; the bottom of the first support (6-1) is sleeved on the second support (6-2), and the inner cavity is provided with a limiting channel (13) that cooperates with the first valve ball (8); the diameter of the limiting channel (13) is larger than the diameter of the buffer channel (10).

4. A hydraulic diaphragm metering pump with a built-in automatic venting valve according to claim 3, characterized in that: The first support (6-1) and the mounting base (2) are respectively provided with a first exhaust channel (14) and a second exhaust channel (15) that are interconnected; the bottom of the first exhaust channel (14) is connected to the limiting groove (13).

5. A hydraulic diaphragm metering pump with a built-in automatic venting valve according to claim 1, characterized in that: The reset elastic element (7) is a spring.

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