Zero-pressure-maintaining pressure regulating valve

Abstract

The utility model provides a zero-pressure-maintaining pressure regulating valve which comprises a valve body with a center channel, and a water inlet channel and a water outlet channel which are communicated with the center channel are arranged at the left end and the right end of the valve body respectively. A pressure regulating cavity is formed in the upper end of the valve body; a pressure regulating assembly is mounted in the pressure regulating cavity; a one-way valve assembly is arranged at the end, facing the valve body, of the water outlet connector. The lower end of the valve body is provided with a mounting channel communicated with the central channel; the mounting channel comprises an upper channel and a lower channel; the diameter of the upper channel is smaller than that of the lower channel; the pressure relief assembly comprises a pressure relief valve seat, a reset spring, a push rod and a base. The pressure relief valve seat is mounted at the communication part of the central channel and the pressure relief cavity; the base is arranged at the opening of the lower channel; the side wall of the lower end of the push rod is attached to the lower channel in a sliding mode, and the upper end abuts against a center hole of the pressure relief valve seat. An upper ring table is arranged on the side wall, located on the upper channel, of the push rod and slides in the mode of being attached to the upper channel. According to the utility model, the recoil pressure can be completely unloaded when a user closes the spray gun.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pressure regulating valve for plunger pump, in particular to a zero pressure retaining pressure regulating valve. BACKGROUND

[0002] The high-pressure cleaning machine delivers high-pressure water through a handheld spray gun, and the user often works intermittently when using the handheld spray gun, which may cause the handheld spray gun to be temporarily closed. When the handheld spray gun is closed, due to the water hammer effect, a backflush pressure will be formed at the handheld spray gun and the water outlet of the pressure regulating valve of the high-pressure cleaning machine, and the backflush pressure will be greater than the pressure during normal operation.

[0003] There are two ways to handle this backflush pressure in the industry:

[0004] The first way is to retain the backflush pressure, which will affect the service life of the high-pressure pipe and the handheld spray gun.

[0005] The second way is to make a structure at the water outlet cone valve of the pressure regulating valve, which gradually unloads the backflush pressure by using the pressure difference inside the pressure regulating valve. Since it is completely unloaded by using the pressure difference, the pressure regulating valve will fail when the sealing element is damaged. SUMMARY

[0006] Therefore, the utility model aims to provide a zero pressure retaining pressure regulating valve which can completely unload the backflush pressure when the user closes the spray gun.

[0007] To achieve the above purpose, the technical scheme of the utility model is as follows:

[0008] A zero pressure retaining pressure regulating valve, comprising a valve body with a central channel, the left and right ends of the valve body are respectively provided with a water inlet channel and a water outlet channel which are in communication with the central channel; the upper end of the valve body is provided with a pressure regulating cavity, the pressure regulating cavity is installed with a pressure regulating assembly; the water outlet channel is installed with a water outlet connector, one end of the water outlet connector towards the valve body is provided with a one-way valve assembly; the lower end of the valve body is provided with an installation channel which is in communication with the central channel; the installation channel comprises an upper channel and a lower channel, the diameter of the upper channel is smaller than that of the lower channel;

[0009] The valve body is provided with: a pressure relief cavity for communicating the pressure regulating cavity with the central channel, a pressure relief hole for communicating the pressure relief cavity with the outside, a first channel for communicating the water inlet channel with the lower channel, and a second channel for communicating the pressure regulating cavity with the water outlet channel;

[0010] The pressure relief assembly comprises a pressure relief valve seat, a reset spring, a push rod and a base; the pressure relief valve seat is installed at the communication position of the central passage and the pressure relief cavity; the base is arranged at the opening of the lower passage; the lower end side wall of the push rod is in sliding fit with the lower passage, and the upper end is abutted against the central hole of the pressure relief valve seat; the upper ring table is arranged on the side wall of the upper passage, and the upper ring table is in sliding fit with the upper passage; the reset spring is arranged in the upper passage and sleeved on the push rod, the upper end of the reset spring is abutted against the upper limiting table at the upper end of the upper passage, and the lower end is abutted against the upper ring table.

[0011] Preferably, the one-way valve assembly comprises a cone valve, a cone valve seat and a second spring;

[0012] The left end of the water outlet joint is provided with a mounting groove, and the right end is provided with a connecting port; the mounting groove is in communication with the connecting port;

[0013] The cone valve seat is arranged in sliding fit at the left end of the water outlet passage, and the side wall of the cone valve seat is provided with an opening hole corresponding to the position of the second passage;

[0014] The cone valve is arranged in sliding fit in the mounting groove, the left end of the cone valve extends into the cone valve seat, the right end is provided with a flow passage, and the side wall of the cone valve is provided with a flow hole in communication with the flow passage; the second spring is arranged in the mounting groove and abutted against the cone valve at one end and the mounting groove at the other end;

[0015] In a natural state, the cone valve is pushed by the second spring and the left end is abutted against the cone valve seat.

[0016] Preferably, when the cone valve is abutted against the cone valve seat, an overflow gap is formed between the cone valve and the cone valve seat.

[0017] Preferably, the middle part of the push rod is provided with a pressure guiding passage, and the side wall of the push rod is provided with a pressure guiding hole for communicating the central passage and the pressure guiding passage.

[0018] Preferably, the lower end surface of the push rod is provided with a sleeve hole, and the upper end of the base is provided with a sleeve column in sliding fit with the sleeve hole; the sleeve hole is in communication with the pressure guiding passage.

[0019] Preferably, when the upper end of the push rod is abutted against the pressure relief valve seat, a pressure relief gap is formed therebetween.

[0020] Preferably, the cross-sectional area of the lower end of the push rod is greater than that of the upper end.

[0021] Preferably, the valve body is further provided with a third passage for communicating the upper passage and the water outlet passage.

[0022] The technical effects of the utility model mainly embody in the following aspects:

[0023] The pressure relief valve is unloaded by using the pressure difference inside the pressure relief valve and by configuring an auxiliary mechanical pushing spring. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 A schematic diagram of the normal working state of the pressure relief valve in the embodiment;

[0025] Figure 2 A schematic diagram of the backflushing state of the pressure relief valve in the embodiment;

[0026] Figure 3 A schematic diagram of the complete pressure relief state of the pressure relief valve in the embodiment.

[0027] The drawings show that the pressure relief valve comprises a valve body 1, a center passage 11, a water inlet passage 12, a water outlet passage 13, a pressure regulating chamber 14, a first passage 16, a second passage 17, a third passage 18, a pressure relief hole 19, a pressure relief chamber 20, a push rod 51, a base 52, a reset spring 53, a pressure relief valve seat 54, an upper ring platform 55, a pressure regulating assembly 6 and a valve rod 61. DETAILED DESCRIPTION

[0028] The specific embodiments of the utility model are further described in detail below in combination with the drawings, so that the technical scheme of the utility model is easier to understand and master.

[0029] Reference Figure 1 The embodiment provides a zero-pressure-maintaining pressure regulating valve, which comprises a valve body 1 provided with a center passage, and a water inlet passage 12 and a water outlet passage 13 are arranged at the left end and the right end of the valve body 1 respectively and are communicated with the center passage; the upper end of the valve body 1 is provided with a pressure regulating chamber 14, and the lower end of the valve body 1 is provided with a mounting passage communicated with the center passage. The mounting passage comprises an upper passage 151 and a lower passage 152, and the diameter of the upper passage 151 is smaller than that of the lower passage 152.

[0030] The valve body 1 is further provided with a pressure relief chamber 20 for communicating the pressure regulating chamber 14 with the center passage, a pressure relief hole 19 for communicating the pressure relief chamber 20 with the outside, a first passage 16 for communicating the water inlet passage 12 with the lower passage 152, a second passage 17 for communicating the pressure regulating chamber 14 with the water outlet passage 13 and a third passage 18 for communicating the upper passage 151 with the water outlet passage 13.

[0031] The pressure regulating chamber 14 is provided with a pressure regulating assembly 6, and the structural principle of the pressure regulating assembly 6 is the prior art, and the embodiment will not be specifically described.

[0032] The water outlet channel 13 is provided with a water outlet joint 3, and the water outlet joint 3 is provided with a one-way valve assembly at one end of the valve body 1; the one-way valve assembly comprises a cone valve 42, a cone valve seat 41 and a second spring 43. The left end of the water outlet joint 3 has a mounting groove, and the right end has a connecting port, and the mounting groove is in communication with the connecting port; the connecting port is used for connecting a spray gun.

[0033] The cone valve seat 41 is attached to the left end of the water outlet channel 13, and the side wall of the cone valve seat 41 is provided with an opening hole corresponding to the position of the second channel 17.

[0034] The cone valve 42 is slidably arranged in the mounting groove, the left end of the cone valve 42 extends into the cone valve seat 41, the right end of the cone valve 42 is provided with a flow passage, and the side wall of the cone valve 42 close to the opening hole is provided with a flow hole in communication with the flow passage.

[0035] The second spring 43 is arranged in the mounting groove and abuts against one end of the cone valve 42 and the other end of the mounting groove; in a natural state, the cone valve 42 is pushed by the second spring 43 and the front end abuts against the cone valve seat 41. In addition, when the cone valve 42 abuts against the cone valve seat 41, an overflow gap is formed between the cone valve 42 and the cone valve seat 41, which allows fluid to gradually flow from the water outlet channel 13 into the center channel 11.

[0036] Further comprising a pressure relief assembly, the pressure relief assembly comprises a pressure relief valve seat 54, a reset spring 53, a push rod 51 and a base 52; wherein the pressure relief valve seat 54 is installed at the communication between the center channel 11 and the pressure relief cavity 20. The base 52 is arranged at the lower end opening of the lower channel 152, specifically threaded connection.

[0037] The lower end side wall of the push rod 51 slidably abuts against the lower channel 152, and the upper end abuts against the center hole of the pressure relief valve seat 54. Specifically, the side wall of the lower end of the push rod 51 is provided with a circular table, the circular table slidably abuts against the mounting channel, and the side wall of the circular table is nested with a sealing ring, which has a good water blocking effect.

[0038] The upper ring table 55 is arranged on the side wall of the push rod 51, and the upper ring table 55 slidably abuts against the upper channel 151; the reset spring 53 is arranged in the upper channel 151 and is sleeved on the push rod 51, the upper end of the reset spring 53 abuts against the upper limiting table 153 at the upper end of the upper channel 151, and the lower end abuts against the upper ring table 55. The side wall of the lower limiting table is provided with a sealing ring, which has a good water blocking effect. The upper end of the push rod 51 abuts against the center hole of the pressure relief valve seat 54, and when the upper end of the push rod 51 abuts against the pressure relief valve seat 54, a pressure relief gap is formed therebetween.

[0039] The lower end of the push rod 51 is sleeved with the base 52, specifically, the lower end of the push rod 51 is provided with a sleeve hole, and the upper end of the base 52 is provided with a sleeve column matched with the sleeve hole; the sleeve hole is communicated with the pressure guiding channel 511. The side wall of the sleeve column is embedded with a sealing ring, which has a good water blocking effect.

[0040] The cross-sectional area of the lower end of the push rod 51 is larger than that of the upper end, and the middle part of the push rod 51 is provided with the pressure guiding channel 511, and the side wall of the push rod 51 is provided with a pressure guiding hole 512 for communicating the central channel 11 and the pressure guiding channel 511. In this way, the comprehensive pressure on the push rod 51 has an upward trend.

[0041] The working principle of the embodiment is as follows:

[0042] When the water outlet is balanced, referring to Figure 1 , the cone valve 42 is pushed open to the right by high-pressure water, at this time, the high-pressure water of the water inlet channel 12 enters the lower channel 152 through the first channel 16, part of the water in the central channel 11 enters the pressure guiding channel 511, and the water of the water outlet channel 13 enters the pressure regulating cavity 14 through the second channel 17, so that the valve rod 61 of the pressure regulating assembly 6 moves downward and abuts against the top end of the push rod 51; but at this time, the water pressure at the lower end of the push rod 51 is large, which has a tendency to push the push rod 51 upward, therefore, the valve rod 61 cannot press the push rod 51 downward.

[0043] When the spray gun is closed, referring to Figure 2 , the cone valve 42 is pushed by the backflushing pressure and abuts against the cone valve seat 41, at this time, the high-pressure water enters the pressure regulating cavity 14 through the second channel 17 to continue to push the valve rod 61 downward, at the same time, the high-pressure water enters the upper channel 151 through the third channel 18, which also pushes the push rod 51 downward, at this time, the downward pressure is greater than the upward pressure on the push rod 51, and then the push rod 51 moves downward until it abuts against the base 52. Then the pressure relief valve seat 54 is opened, and the high-pressure water in the central channel 11 enters the pressure relief cavity 20 and flows out from the pressure relief hole 19. At the same time, the high-pressure water of the water outlet channel 13 gradually enters the central channel 11 through the gap between the cone valve 42 and the cone valve seat 41, thereby releasing the pressure of the water outlet channel 13.

[0044] After the pressure relief is completed, the valve rod 61 of the pressure regulating assembly 6 resets and moves upward, at this time, the reset spring 53 keeps the downward pushing force on the push rod 51, and then the push rod 51 will not move upward, thereby keeping the current position and waiting for the next start of the spray gun.

[0045] Of course, the above is only a typical example of the present application, in addition to this, the present application can have other various specific implementation manners, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of the present application.

Claims

1. A zero pressure retaining pressure regulating valve, comprising a valve body (1) having a central passage (11), water inlet passage (12) and water outlet passage (13) are arranged at left and right ends of the valve body (1) respectively and communicate with the central passage (11); a pressure regulating cavity (14) is arranged at the upper end of the valve body (1), a pressure regulating assembly (6) is arranged in the pressure regulating cavity (14); a water outlet connector (3) is arranged in the water outlet passage (13), a one-way valve assembly is arranged at one end of the water outlet connector (3) which faces the valve body (1); characterized in that, The lower end of the valve body (1) is provided with a mounting channel in communication with the central channel (11); the mounting channel comprises an upper channel (151) and a lower channel (152), and the diameter of the upper channel (151) is smaller than that of the lower channel (152); The valve body (1) is provided with a pressure relief chamber (20) for communicating the pressure regulating chamber (14) with the central channel, a pressure relief hole (19) for communicating the pressure relief chamber (20) with the outside, a first channel (16) for communicating the water inlet channel (12) with the lower channel (152), and a second channel (17) for communicating the pressure regulating chamber (14) with the water outlet channel (13). Further comprising a pressure relief assembly, the pressure relief assembly comprises a pressure relief valve seat (54), a reset spring (53), a push rod (51) and a base (52); wherein the pressure relief valve seat (54) is installed at the communication position of the central channel and the pressure relief chamber (20); the base (52) is arranged at the opening of the lower channel (152); the lower end side wall of the push rod (51) is in close sliding fit with the lower channel (152), and the upper end is in abutment with the central hole of the pressure relief valve seat (54); the upper end of the push rod (51) is provided with an upper ring table (55) on the side wall of the upper channel (151), and the upper ring table (55) is in close sliding fit with the upper channel (151); the reset spring (53) is located in the upper channel (151) and is sleeved on the push rod (51), the upper end of the reset spring (53) is in abutment with the upper limiting table (153) at the upper end of the upper channel (151), and the lower end is in abutment with the upper ring table (55).

2. The zero hold-up pressure regulating valve according to claim 1, wherein The one-way valve assembly comprises a cone valve (42), a cone valve seat (41) and a second spring (43); The left end of the water outlet connector (3) has a mounting groove, and the right end has a connecting port, and the mounting groove and the connecting port are in communication; The cone valve seat (41) is arranged in close fit at the left end of the water outlet channel (13), and the side wall of the cone valve seat (41) is provided with an opening at a position corresponding to the second channel (17); The cone valve (42) is arranged in sliding fit in the mounting groove, the left end of the cone valve (42) extends into the cone valve seat (41), the right end is provided with a flow passage, and the side wall of the cone valve (42) is provided with a flow hole in communication with the flow passage; the second spring (43) is arranged in the mounting groove, and one end is in abutment with the cone valve (42) and the other end is in abutment with the mounting groove; In a natural state, the cone valve (42) is pushed by the second spring (43) and the left end is in abutment with the cone valve seat (41).

3. The zero hold-up pressure regulating valve according to claim 2, wherein When the cone valve (42) is in abutment with the cone valve seat (41), an overflow gap is formed between the cone valve (42) and the cone valve seat (41).

4. The zero hold-up pressure regulating valve according to claim 1, wherein The middle part of the push rod (51) is provided with a pressure guiding channel (511), and the side wall of the push rod (51) is provided with a pressure guiding hole (512) for communicating the central channel (11) with the pressure guiding channel (511).

5. A zero hold-up pressure regulating valve according to claim 4, characterised in that The lower end surface of the push rod (51) is provided with a sleeve hole, and the upper end of the base (52) is provided with a sleeve column in sliding fit with the sleeve hole; the sleeve hole is in communication with the pressure guiding channel (511).

6. The zero hold-up pressure regulating valve according to claim 1, wherein When the upper end of the push rod (51) is in abutment with the pressure relief valve seat (54), a pressure relief gap is formed therebetween.

7. The zero hold open pressure regulating valve of claim 1 wherein, The lower end cross-sectional area of the push rod (51) is larger than the upper end cross-sectional area.

8. The zero hold open pressure regulating valve of claim 1 wherein, The valve body (1) is further provided with a third channel (18) for connecting the upper channel (151) with the water outlet channel (13).

Images