Electric proportional valve

Abstract

The invention relates to the field of valves, and particularly discloses an electric proportional valve which comprises a base, a valve body, a diaphragm lower seat, a diaphragm upper seat, a valve seat and a valve cover which are sequentially arranged from bottom to top, and a rubber diaphragm is arranged between the diaphragm lower seat and the diaphragm upper seat; the valve cover, the valve seat and the diaphragm upper seat are connected through a first screw, the valve cover is provided with a first counterbore for the first screw to penetrate through, the valve seat is provided with a first through hole for the first screw to penetrate through, and the diaphragm upper seat is provided with a threaded hole in threaded fit with the first screw; the valve body, the diaphragm lower seat and the diaphragm upper seat are connected through a second screw, the valve body is provided with a second counterbore for the second screw to penetrate through, the diaphragm lower seat is provided with a second penetrating hole for the second screw to penetrate through, and the second screw is in threaded fit with the threaded hole. The electric proportional valve has the advantage that the rubber diaphragm is convenient to disassemble, assemble and replace.

Description

Technical Field

[0001] The present application relates to the field of valves, and in particular to an electric proportional valve. Background Art

[0002] The electric proportional valve is a device that uses electrical signals to control gas pressure and flow. It has the advantages of stepless regulation, remote control, high precision, and strong stability. It is widely used in industrial automation systems. The working principle of the electric proportional valve is as follows: the control circuit uses the deviation between the input signal and the output secondary pressure as the basis, and drives the inlet and exhaust solenoid valves with PWM control to adjust the pilot chamber pressure until the deviation is zero, the inlet and exhaust solenoid valves are closed, and the main valve core reaches balance in the new position, thereby obtaining an output pressure proportional to the input signal.

[0003] In the related art, the diaphragm assembly of the electric proportional valve is an important component, which can quickly open, close and adjust the valve by quickly responding to changes in the control signal. The diaphragm is mostly made of rubber. Since it often expands and contracts during operation, it is prone to fatigue and aging cracks, which affects the performance and efficiency of the valve. However, the disassembly and assembly of the diaphragm is generally troublesome, and the entire valve needs to be disassembled, which is time-consuming and labor-intensive, and needs to be improved. Summary of the invention

[0004] In order to facilitate the disassembly and assembly of the diaphragm, the present application provides an electric proportional valve.

[0005] The electric proportional valve provided in this application adopts the following technical solution: An electric proportional valve comprises a base, a valve body, a diaphragm lower seat, a diaphragm upper seat, a valve seat and a valve cover which are arranged in sequence from bottom to top, wherein a rubber diaphragm is arranged between the diaphragm lower seat and the diaphragm upper seat; The valve cover, the valve seat and the diaphragm upper seat are connected by a first screw, the valve cover is provided with a first countersunk hole for the first screw to pass through, the valve seat is provided with a first through hole for the first screw to pass through, and the diaphragm upper seat is provided with a threaded hole that matches the thread of the first screw; The valve body, the diaphragm lower seat and the diaphragm upper seat are connected by a second screw, the valve body is provided with a second countersunk hole for the second screw to pass through, the diaphragm lower seat is provided with a second through hole for the second screw to pass through, and the second screw is threadedly matched with the threaded hole.

[0006] By adopting the above technical solution, when the performance of the electric proportional valve decreases due to aging of the rubber diaphragm, the second screw is unscrewed to separate the diaphragm lower seat from the diaphragm upper seat, and the rubber diaphragm can be easily taken out and replaced. When the rubber diaphragm is disassembled, the valve cover, valve seat and diaphragm upper seat are still relatively fixed, and there is no need to re-assemble, which saves time and effort.

[0007] Optionally, the rubber diaphragm includes a connecting portion, an arc-shaped portion and a clamping portion which are arranged in sequence from the inside to the outside, the clamping portion is pressed between the diaphragm lower seat and the diaphragm upper seat, the clamping portion is connected with a convex ring, the diaphragm lower seat is provided with a groove for inserting the convex ring, an upper pressing plate is arranged on the upper side of the connecting portion, a lower pressing plate is arranged on the lower side of the connecting portion, the upper pressing plate and the lower pressing plate are connected by screws, and a diaphragm spring is arranged between the lower pressing plate and the diaphragm lower seat.

[0008] By adopting the above technical solution, the rubber diaphragm has a good fixing effect and strong sealing performance.

[0009] Optionally, the diaphragm lower seat is connected to a positioning assembly for compressing the diaphragm spring, the positioning assembly includes a connecting rod, a first positioning rod and a second positioning rod, two connecting rods are provided and are respectively threadedly connected to both sides of the diaphragm lower seat, the axis of the connecting rod is arranged horizontally, the first positioning rod and the second positioning rod are respectively connected to the opposite ends of the two connecting rods, the first positioning rod and the second positioning rod both pass through the upper end of the diaphragm spring, the first positioning rod is connected to a plug column located on the inner side of the diaphragm spring, and the second positioning rod is provided with a slot for inserting the plug column.

[0010] By adopting the above technical solution, before assembling the new rubber diaphragm, the diaphragm spring is first compressed, and then the two connecting rods are screwed so that the first positioning rod and the second positioning rod pass through the upper end of the diaphragm spring until the plug is inserted into the slot. At this time, the diaphragm spring is positioned and will not excessively push the lower pressure plate, thereby facilitating the placement of the rubber diaphragm on the diaphragm lower seat and facilitating assembly.

[0011] After the assembly is completed, the connecting rod is screwed to separate the first positioning rod and the second positioning rod from the diaphragm spring.

[0012] Optionally, the first positioning rod and the second positioning rod are both connected to threaded columns at opposite ends, and the connecting rod is provided with a threaded groove for the threaded column to be screwed into.

[0013] By adopting the above technical solution, after the new rubber diaphragm is assembled, the first positioning rod and the second positioning rod are first completely removed, then the first positioning rod and the second positioning rod can be removed from the connecting rod, and finally the connecting rod is screwed back to prevent the first positioning rod and the second positioning rod from affecting the normal operation of the valve body.

[0014] Optionally, the connecting rod is fixedly connected with a sealing cap, a sealing gasket is provided on a side of the sealing cap close to the connecting rod, and a sealing groove for inserting the sealing cap is provided on the diaphragm lower seat.

[0015] By adopting the above technical solution, the sealing performance is improved.

[0016] Optionally, a valve stem is provided in the middle of the rubber diaphragm, and two positioning assemblies are symmetrically provided about the valve stem.

[0017] By adopting the above technical solution, the diaphragm spring is evenly compressed and positioned.

[0018] Optionally, an exhaust piston is arranged between the valve body and the lower seat of the diaphragm, and an exhaust spring is arranged between the exhaust piston and the lower seat of the diaphragm.

[0019] Optionally, the diaphragm lower seat is connected to a positioning ring, the second screw is passed through the positioning ring, the valve body is provided with a positioning groove for inserting the positioning ring, the valve body is threadedly connected with a limit screw extending into the positioning groove, and the positioning ring is provided with a limit groove for inserting the limit screw.

[0020] By adopting the above technical solution, when the rubber diaphragm is replaced, the diaphragm lower seat and the valve body are relatively fixed, and there is no need for repeated assembly, which saves time and effort.

[0021] Optionally, a connecting ring is connected to the lower side of the connecting portion, and the lower pressing plate is provided with a connecting groove for inserting the connecting ring.

[0022] Optionally, the base and the valve body are connected via a third screw.

[0023] In summary, this application has the following beneficial effects: When replacing the rubber diaphragm, unscrew the second screw. At this time, the valve cover, valve seat and diaphragm upper seat are relatively fixed by the first screw, the base and valve body are relatively fixed by the third screw, and the valve body and diaphragm lower seat are relatively fixed by the limit screw, so that the components inside maintain a stable assembly state. There is no need to repeat the assembly. The aged rubber diaphragm can be directly removed and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a structural schematic diagram of an electric proportional valve according to an embodiment of the present application; Figure 2 is a schematic top view of an electric proportional valve according to an embodiment of the present application; Figure 3 yes Figure 2 Schematic cross-sectional view along line AA; Figure 4 yes Figure 3 A magnified schematic diagram of the middle B area; Figure 5 yes Figure 3 Enlarged schematic diagram of the middle C area; Figure 6 Schematic diagram of the structure of the diaphragm lower seat, positioning assembly and diaphragm spring of the embodiment of the present application; Figure 7 is an exploded schematic diagram of a connecting rod and a first positioning rod in an embodiment of the present application; Figure 8It is a schematic structural diagram of a connecting rod and a second positioning rod in an embodiment of the present application.

[0025] Description of the reference numerals: 1, base; 2, valve body; 21, second countersunk hole; 22, positioning groove; 3, diaphragm lower seat; 31, second through hole; 32, groove; 33, sealing groove; 34, positioning ring; 341, limiting groove; 4, diaphragm upper seat; 41, threaded hole; 5, valve seat; 51, first through hole; 6, valve cover; 61, first countersunk hole; 7, rubber diaphragm; 71, connecting part; 72, arc part; 73, clamping part; 74, convex ring; 75, connecting ring; 8, first thread nail; 9, second screw; 10, upper pressure plate; 11, lower pressure plate; 111, connecting groove; 12, third screw; 13, diaphragm spring; 14, positioning assembly; 141, connecting rod; 1411, threaded groove; 142, first positioning rod; 1421, plug column; 143, second positioning rod; 1431, slot; 144, threaded column; 145, sealing cap; 146, sealing gasket; 15, valve stem; 16, exhaust piston; 17, exhaust spring; 18, limit screw. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-8 This application is described in further detail.

[0027] The embodiment of the present application discloses an electric proportional valve.

[0028] Reference Figure 1 The electric proportional valve comprises a base 1, a valve body 2, a diaphragm lower seat 3, a diaphragm upper seat 4, a valve seat 5 and a valve cover 6 which are arranged in sequence from bottom to top.

[0029] Reference Figure 2 , Figure 3 A rubber diaphragm 7 is arranged between the diaphragm lower seat 3 and the diaphragm upper seat 4. An upper pressing plate 10 is arranged on the upper side of the rubber diaphragm 7, and a lower pressing plate 11 is arranged on the lower side of the rubber diaphragm 7. The upper pressing plate 10 and the lower pressing plate 11 are connected by screws, and a diaphragm spring 13 is abutted between the lower pressing plate 11 and the diaphragm lower seat 3. A valve stem 15 is passed through the middle of the rubber diaphragm 7, and the upper end of the valve stem 15 is clamped between the upper pressing plate 10 and the lower pressing plate 11. An exhaust piston 16 is arranged between the valve body 2 and the diaphragm lower seat 3, and an exhaust spring 17 is abutted between the exhaust piston 16 and the diaphragm lower seat 3.

[0030] It should be noted that the above structure and other components not mentioned are all prior art and will not be described in detail here.

[0031] Reference Figure 1 , Figure 3In order to facilitate the separate disassembly and assembly of the rubber diaphragm 7, the valve cover 6, the valve seat 5 and the diaphragm upper seat 4 are connected by a first screw 8. The valve cover 6 is provided with a first countersunk hole 61 for the first screw 8 to pass through, and the valve seat 5 is provided with a first through hole 51 for the first screw 8 to pass through. The valve body 2, the diaphragm lower seat 3 and the diaphragm upper seat 4 are connected by a second screw 9. The valve body 2 is provided with a second countersunk hole 21 for the second screw 9 to pass through, and the diaphragm lower seat 3 is provided with a second through hole 31 for the second screw 9 to pass through. The diaphragm upper seat 4 is provided with a threaded hole 41, and the first screw 8 and the second screw 9 are respectively threadedly matched with both ends of the threaded hole 41. The base 1 and the valve body 2 are fixedly connected by a third screw 12.

[0032] Reference Figure 3 , Figure 4 The diaphragm lower seat 3 is fixedly connected with a positioning ring 34, the second screw 9 is passed through the positioning ring 34, the valve body 2 is provided with a positioning groove 22 for the positioning ring 34 to be inserted, the valve body 2 is connected with a limit screw 18 extending into the positioning groove 22 along the transverse thread, and the positioning ring 34 is provided with a limit groove 341 for the rod of the limit screw 18 to be inserted.

[0033] When the performance of the electric proportional valve is reduced due to the aging of the rubber diaphragm 7, unscrew the second screw 9. At this time, the proportional valve is divided into two parts, the upper and lower parts. The valve cover 6, the valve seat 5 and the upper diaphragm seat 4 are still relatively fixed by the first screw 8, and the lower diaphragm seat 3, the valve body 2 and the base 1 are relatively fixed by the third screw 12 and the limit screw 18, so that the components inside will not be exposed, no repeated assembly is required, and the risk of foreign matter entering is avoided. Next, unscrew the screws between the upper pressing plate 10 and the lower pressing plate 11, remove the upper pressing plate 10 and the rubber diaphragm 7, and then replace them with new ones.

[0034] Reference Figure 3 , Figure 5 The rubber diaphragm 7 includes an integrally formed connecting portion 71, an arcuate portion 72, a clamping portion 73, a convex ring 74 and a connecting ring 75. The connecting portion 71, the arcuate portion 72 and the clamping portion 73 are arranged in sequence from the inside to the outside. The clamping portion 73 is pressed between the diaphragm lower seat 3 and the diaphragm upper seat 4. The connecting portion 71 is clamped between the upper pressing plate 10 and the lower pressing plate 11, and the arcuate portion 72 is arched downward. The convex ring 74 is fixedly connected to the lower side of the outer edge of the clamping portion 73, and the connecting ring 75 is fixedly connected to the lower side of the connecting portion 71. The diaphragm lower seat 3 is provided with a groove 32 for the convex ring 74 to be inserted, and the lower pressing plate 11 is provided with a connecting groove 111 for the connecting ring 75 to be inserted. The rubber diaphragm 7 has a good fixing effect and a strong sealing performance.

[0035] Reference Figure 5 , Figure 6 The diaphragm lower seat 3 is connected to a positioning assembly 14 for compressing the diaphragm spring 13 . Two positioning assemblies 14 are symmetrically arranged about the valve stem 15 , and can achieve uniform compression and positioning of the diaphragm spring 13 .

[0036] Reference Figure 6 , Figure 7 The positioning assembly 14 includes a connecting rod 141, a first positioning rod 142 and a second positioning rod 143. Two connecting rods 141 are provided and are respectively threadedly connected to both sides of the diaphragm lower seat 3. The axis of the connecting rod 141 is arranged in the horizontal direction, and the first positioning rod 142 and the second positioning rod 143 are respectively connected to the opposite ends of the two connecting rods 141. The opposite ends of the first positioning rod 142 and the second positioning rod 143 both pass through the upper end of the diaphragm spring 13. The diaphragm spring 13 is pressed by the first positioning rod 142 and the second positioning rod 143 and is in a highly compressed state, so that it will not excessively push the lower pressing plate 11, thereby facilitating the placement of the rubber diaphragm 7 on the diaphragm lower seat 3 and facilitating assembly.

[0037] Reference Figure 7 , Figure 8 One end of the first positioning rod 142 close to the second positioning rod 143 is fixedly connected to a plug post 1421 located on the inner side of the diaphragm spring 13, and the second positioning rod 143 is provided with a slot 1431 for the plug post 1421 to be inserted, so that the connection tightness between the first positioning rod 142 and the second positioning rod 143 is improved, thereby improving the pressure-bearing performance of the diaphragm spring 13.

[0038] Reference Figure 6 , Figure 7 The first positioning rod 142 and the second positioning rod 143 are fixedly connected with a threaded column 144 at the opposite ends, and the connecting rod 141 is provided with a threaded groove 1411 for the threaded column 144 to be screwed in. The first positioning rod 142 and the second positioning rod 143 have the same diameter and are smaller than the connecting rod 141. Therefore, the connecting rod 141 can be completely screwed out, and then the first positioning rod 142 and the second positioning rod 143 can be pulled out and removed, so as to avoid the first positioning rod 142 and the second positioning rod 143 affecting the normal operation of the valve body 2 after the assembly is completed.

[0039] Reference Figure 6 , Figure 7 The connecting rod 141 is fixedly connected with a sealing cap 145, and a sealing gasket 146 is provided on the side of the sealing cap 145 close to the connecting rod 141. The sealing gasket 146 is sleeved on the outside of the connecting rod 141. The diaphragm lower seat 3 is provided with a sealing groove 33 for inserting the sealing cap 145 and the sealing gasket 146, and the sealing cap 145 is provided with a cross groove. The sealing cap 145 is screwed until the sealing gasket 146 is pressed against the bottom wall of the sealing groove 33. At this time, the sealing performance is high and the normal use of the valve body 2 is not affected.

[0040] The implementation principle of the electric proportional valve in the embodiment of the present application is: First, unscrew the second screw 9 to separate the diaphragm upper seat 4 and the diaphragm lower seat 3; then, disassemble the upper pressing plate 10 and the lower pressing plate 11, and remove the aged rubber diaphragm 7; then, unscrew the connecting rod 141, and install the first positioning rod 142 and the second positioning rod 143, then press the pressing plate 11 down, and screw back the connecting rod 141, so that the first positioning rod 142 and the second positioning rod 143 are inserted into the diaphragm spring 13; then, install the new rubber diaphragm 7, replace the upper pressing plate 10 and the diaphragm upper seat 4, and screw in the second screw 9; finally, unscrew the connecting rod 141, remove the first positioning rod 142 and the second positioning rod 143 from the connecting rod 141, and screw back the connecting rod 141.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric proportional valve, characterized in that: The valve comprises a base (1), a valve body (2), a diaphragm lower seat (3), a diaphragm upper seat (4), a valve seat (5) and a valve cover (6) which are arranged in sequence from bottom to top, wherein a rubber diaphragm (7) is arranged between the diaphragm lower seat (3) and the diaphragm upper seat (4); The valve cover (6), the valve seat (5) and the diaphragm upper seat (4) are connected by a first screw (8); the valve cover (6) is provided with a first countersunk hole (61) for the first screw (8) to pass through; the valve seat (5) is provided with a first through hole (51) for the first screw (8) to pass through; and the diaphragm upper seat (4) is provided with a threaded hole (41) threadably matched with the first screw (8); The valve body (2), the diaphragm lower seat (3) and the diaphragm upper seat (4) are connected by a second screw (9); the valve body (2) is provided with a second countersunk hole (21) for the second screw (9) to pass through; the diaphragm lower seat (3) is provided with a second through hole (31) for the second screw (9) to pass through; the second screw (9) is threadedly matched with the threaded hole (41).

2. The electric proportional valve according to claim 1, characterized in that: The rubber diaphragm (7) comprises a connecting portion (71), an arcuate portion (72) and a clamping portion (73) which are arranged in sequence from the inside to the outside; the clamping portion (73) is pressed between the diaphragm lower seat (3) and the diaphragm upper seat (4); the clamping portion (73) is connected with a convex ring (74); the diaphragm lower seat (3) is provided with a groove (32) for the convex ring (74) to be inserted; an upper pressing plate (10) is arranged on the upper side of the connecting portion (71); a lower pressing plate (11) is arranged on the lower side of the connecting portion (71); the upper pressing plate (10) and the lower pressing plate (11) are connected by screws; a diaphragm spring (13) is arranged between the lower pressing plate (11) and the diaphragm lower seat (3).

3. The electric proportional valve according to claim 2, characterized in that: The diaphragm lower seat (3) is connected to a positioning assembly (14) for compressing the diaphragm spring (13), and the positioning assembly (14) includes a connecting rod (141), a first positioning rod (142) and a second positioning rod (143). The connecting rod (141) is provided with two and is respectively threadedly connected to the two sides of the diaphragm lower seat (3). The axis of the connecting rod (141) is arranged in the transverse direction. The first positioning rod (142) and the second positioning rod (143) are respectively connected to the opposite ends of the two connecting rods (141). The first positioning rod (142) and the second positioning rod (143) both pass through the upper end of the diaphragm spring (13). The first positioning rod (142) is connected to a plug post (1421) located on the inner side of the diaphragm spring (13), and the second positioning rod (143) is provided with a slot (1431) for the plug post (1421) to be inserted.

4. The electric proportional valve according to claim 3, characterized in that: The first positioning rod (142) and the second positioning rod (143) are both connected to a threaded column (144) at their opposite ends, and the connecting rod (141) is provided with a threaded groove (1411) for the threaded column (144) to be screwed into.

5. The electric proportional valve according to claim 4, characterized in that: The connecting rod (141) is fixedly connected to a sealing cap (145), a sealing gasket (146) is provided on a side of the sealing cap (145) close to the connecting rod (141), and the diaphragm lower seat (3) is provided with a sealing groove (33) for the sealing cap (145) to be inserted.

6. The electric proportional valve according to claim 3, characterized in that: A valve stem (15) is arranged in the middle of the rubber diaphragm (7), and two positioning assemblies (14) are symmetrically arranged about the valve stem (15).

7. The electric proportional valve according to claim 1, characterized in that: An exhaust piston (16) is arranged between the valve body (2) and the diaphragm lower seat (3), and an exhaust spring (17) is arranged between the exhaust piston (16) and the diaphragm lower seat (3).

8. The electric proportional valve according to claim 7, characterized in that: The diaphragm lower seat (3) is connected to a positioning ring (34), the second screw (9) is inserted into the positioning ring (34), the valve body (2) is provided with a positioning groove (22) for the positioning ring (34) to be inserted, the valve body (2) is threadedly connected to a limit screw (18) extending into the positioning groove (22), and the positioning ring (34) is provided with a limit groove (341) for the limit screw (18) to be inserted.

9. The electric proportional valve according to claim 2, characterized in that: A connecting ring (75) is connected to the lower side of the connecting portion (71), and the lower pressing plate (11) is provided with a connecting groove (111) for inserting the connecting ring (75).

10. The electric proportional valve according to claim 1, characterized in that: The base (1) and the valve body (2) are connected via a third screw (12).

Images