Zero-pressure-maintaining pressure regulating valve

Abstract

The zero-pressure-maintaining pressure regulating valve comprises a valve body with a central flow channel, and a water inlet channel and a water outlet channel which communicate with the central flow channel are formed in the left end and the right end of the valve body correspondingly; 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 flow 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 flow 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 invention, the recoil pressure can be completely unloaded when a user closes the spray gun.

Description

Technical Field

[0001] The invention relates to a pressure regulating valve for a plunger pump, in particular to a zero pressure maintaining pressure regulating valve. Background Art

[0002] High-pressure cleaners deliver high-pressure water through handheld spray guns. Users often use handheld spray guns intermittently and may temporarily turn off the handheld spray gun. When the handheld spray gun is turned off, due to the water hammer effect, recoil pressure will be formed at the handheld spray gun and the water outlet of the pressure regulating valve of the high-pressure cleaner, and the recoil pressure will be greater than the pressure during normal operation.

[0003] There are two ways in the industry to deal with this backlash pressure: The first method is to retain the recoil pressure, which will affect the service life of the high-pressure pipe and the handheld spray gun.

[0004] The second method is to make a structure at the outlet cone valve of the pressure regulating valve, and use the internal pressure difference of the pressure regulating valve to gradually unload the recoil pressure. Since the pressure difference is used to achieve unloading, the pressure regulating valve will fail when the seal is damaged. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a zero-pressure-maintaining pressure regulating valve, which can completely unload the recoil pressure when the user closes the spray gun.

[0006] In order to achieve the above object, the technical solution of the present invention is: A zero-pressure-maintaining pressure regulating valve comprises a valve body having a central flow channel, wherein the left and right ends of the valve body are respectively provided with a water inlet channel and a water outlet channel connected with the central flow channel; the upper end of the valve body is provided with a pressure regulating chamber, wherein the pressure regulating chamber is provided with a pressure regulating assembly; the water outlet channel is provided with a water outlet joint, wherein a one-way valve assembly is provided at one end of the water outlet joint facing the valve body; the lower end of the valve body is provided with an installation channel connected with the central flow channel; the installation channel comprises an upper channel and a lower channel, wherein the diameter of the upper channel is smaller than that of the lower channel; The valve body is provided with: a pressure relief chamber for connecting the pressure regulating chamber with the central flow channel, a pressure relief hole for connecting the pressure relief chamber with the outside, a first channel for connecting the water inlet channel with the lower channel, and a second channel for connecting the pressure regulating chamber with the water outlet channel; It also includes a pressure relief assembly, which includes a pressure relief valve seat, a return spring, a push rod and a base; wherein the pressure relief valve seat is installed at the connection between the central flow channel and the pressure relief chamber; the base is arranged at the opening of the lower channel; the lower end side wall of the push rod fits and slides with the lower channel, and the upper end abuts against the center hole of the pressure relief valve seat; the push rod is located on the side wall of the upper channel and is provided with an upper ring platform, and the upper ring platform fits and slides with the upper channel; the return spring is located in the upper channel and is sleeved on the push rod, the upper end of the return spring abuts against the upper limit platform at the upper end of the upper channel, and the lower end abuts against the upper ring platform.

[0007] Preferably, the one-way valve assembly comprises a cone valve, a cone valve seat and a second spring; The water outlet joint has a mounting groove at its left end and a connecting port at its right end, and the mounting groove is in communication with the connecting port; The cone valve seat is fitted at the left end of the water outlet channel, and an opening is provided on the side wall of the cone valve seat corresponding to the position of the second channel; The cone valve is slidably arranged in the mounting groove, the left end of the cone valve extends into the cone valve seat, the right end is penetrated by a flow passage, and a flow hole communicating with the flow passage is opened on the side wall of the cone valve; the second spring is arranged in the mounting groove, and one end of the second spring abuts against the cone valve, and the other end abuts against the mounting groove; In a natural state, the cone valve is pushed by the second spring and the left end abuts against the cone valve seat.

[0008] Preferably, when the cone valve abuts against the cone valve seat, an overflow gap is formed between the cone valve and the cone valve seat.

[0009] Preferably, a pressure-inducing channel is provided in the middle of the push rod, and a pressure-inducing hole for connecting the central channel with the pressure-inducing channel is opened on the side wall of the push rod.

[0010] Preferably, a sleeve hole is provided on the lower end surface of the push rod, and a sleeve column slidably matched with the sleeve hole is provided on the upper end of the base; the sleeve hole is communicated with the pressure-inducing channel.

[0011] Preferably, when the upper end of the push rod abuts against the pressure relief valve seat, a pressure relief gap is formed therebetween.

[0012] Preferably, the cross-sectional area of ​​the lower end of the push rod is larger than the cross-sectional area of ​​the upper end.

[0013] Preferably, the valve body is further provided with a third channel for connecting the upper channel with the water outlet channel.

[0014] The technical effects of the present invention are mainly reflected in the following aspects: By utilizing the internal pressure difference of the pressure regulating valve and configuring an auxiliary mechanical push spring, the function of completely unloading the recoil pressure inside the pressure regulating valve can be realized when the user closes the handheld spray gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the normal working state of the pressure regulating valve in the embodiment; Figure 2 Schematic diagram of the backwash state of the pressure regulating valve in the embodiment; Figure 3 Schematic diagram of the pressure regulating valve in the embodiment in the fully depressurized state.

[0016] Figure numerals: 1. valve body; 11. center channel; 12. water inlet channel; 13. water outlet channel; 14. pressure regulating chamber; 151. upper channel; 152. lower channel; 153. upper limit platform; 16. first channel; 17. second channel; 18. third channel; 19. pressure relief hole; 20. pressure relief chamber; 3. water outlet joint; 41. cone valve seat; 42. cone valve; 43. second spring; 51. push rod; 511. pressure-inducing channel; 512. pressure-inducing hole; 52. base; 53. return spring; 54. pressure relief valve seat; 55. upper ring platform; 6. pressure regulating assembly; 61. valve stem. DETAILED DESCRIPTION

[0017] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0018] Reference Figure 1 The present embodiment provides a zero pressure-maintaining pressure regulating valve, comprising a valve body 1 having a central flow channel, the left and right ends of the valve body 1 are respectively provided with a water inlet channel 12 and a water outlet channel 13 connected to the central flow channel; the upper end of the valve body 1 is provided with a pressure regulating chamber 14, and the lower end is provided with an installation channel connected to the central flow channel. The installation channel includes 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.

[0019] The valve body 1 is also provided with: a pressure relief chamber 20 for connecting the pressure regulating chamber 14 with the central flow channel, a pressure relief hole 19 for connecting the pressure relief chamber 20 with the outside, a first channel 16 for connecting the water inlet channel 12 with the lower channel 152, a second channel 17 for connecting the pressure regulating chamber 14 with the water outlet channel 13, and a third channel 18 for connecting the upper channel 151 with the water outlet channel 13.

[0020] The pressure regulating chamber 14 is equipped with a pressure regulating assembly 6 . The structural principle of the pressure regulating assembly 6 is prior art and will not be described in detail in this embodiment.

[0021] The water outlet channel 13 is provided with a water outlet connector 3, and a one-way valve assembly is provided at one end of the water outlet connector 3 facing the valve body 1; the one-way valve assembly includes 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, the mounting groove is connected to the connecting port; the connecting port is used to connect the spray gun.

[0022] The cone valve seat 41 is fitted on the left end of the water outlet channel 13 , and an opening is provided on the side wall of the cone valve seat 41 at a position corresponding to the second channel 17 .

[0023] The cone valve 42 is slidably arranged in the installation 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 penetrated by a flow channel, and a flow hole connected to the flow channel is opened on the side wall of the cone valve 42 close to the opening.

[0024] The second spring 43 is disposed in the mounting groove and one end thereof abuts against the cone valve 42, and the other end thereof abuts against 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, and the overflow gap allows the fluid to gradually enter the central channel 11 from the water outlet channel 13.

[0025] It also includes a pressure relief assembly, which includes a pressure relief valve seat 54, a return spring 53, a push rod 51 and a base 52; wherein the pressure relief valve seat 54 is installed at the connection between the central flow channel and the pressure relief chamber 20. The base 52 is arranged at the lower end opening of the lower channel 152, specifically a threaded connection.

[0026] The lower end side wall of the push rod 51 fits and slides with the lower channel 152, and the upper end abuts against the central hole of the pressure relief valve seat 54. Specifically, a truncated cone is provided on the side wall of the lower end of the push rod 51, which fits and slides with the installation channel, and a sealing ring is embedded in the side wall of the truncated cone, which has a good water blocking effect.

[0027] The push rod 51 is located on the side wall of the upper channel 151 and is provided with an upper ring platform 55, which slides in contact 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 abuts against the upper limit platform 153 at the upper end of the upper channel 151, and the lower end abuts against the upper ring platform 55. A sealing ring is provided on the side wall of the lower limit platform, 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, there is a pressure relief gap between the two.

[0028] The lower end of the push rod 51 is sleeved on the base 52. Specifically, a sleeve hole is opened at the lower end of the push rod 51, and a sleeve column matching the sleeve hole is arranged at the upper end of the base 52; the sleeve hole is connected to the pressure-inducing channel 511. A sealing ring is embedded in the side wall of the sleeve column, which has a good water-blocking effect.

[0029] The cross-sectional area of ​​the lower end of the push rod 51 is larger than that of the upper end, and a pressure channel 511 is provided in the middle of the push rod 51, and a pressure hole 512 is provided on the side wall of the push rod 51 for connecting the central channel 11 with the pressure channel 511. In this way, the comprehensive pressure on the push rod 51 tends to be upward.

[0030] The working principle of this embodiment is: In the balanced water discharge state, refer to Figure 1 , the cone valve 42 is pushed open to the right by the high-pressure water. At this time, the high-pressure water in the water inlet channel 12 enters the lower channel 152 through the first channel 16, a part of the water in the central channel 11 enters the pressure-inducing channel 511, and the water in the water outlet channel 13 enters the pressure-regulating chamber 14 through the second channel 17, so that the valve stem 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 relatively large, and has a tendency to push the push rod 51 upward. Therefore, the valve stem 61 cannot press the push rod 51 downward.

[0031] When the gun is closed, refer to Figure 2 , the cone valve 42 is pushed by the recoil pressure to abut against the cone valve seat 41. At this time, the high-pressure water enters the pressure regulating chamber 14 through the second channel 17 and continues to push the valve stem 61 downward. At the same time, the high-pressure water enters the upper channel 151 through the third channel 18, and also presses 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 chamber 20 and flows out from the pressure relief hole 19. At the same time, the high-pressure water in 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 in the water outlet channel 13.

[0032] After the pressure relief is completed, the valve stem 61 of the pressure regulating assembly 6 returns to its original position and moves upward. At this time, the return spring 53 maintains the downward thrust on the push rod 51, and the push rod 51 does not move upward, thereby maintaining the current position and waiting for the next start of the spray gun.

[0033] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A zero-pressure-maintaining pressure regulating valve, comprising a valve body (1) having a central flow channel, wherein the left and right ends of the valve body (1) are respectively provided with a water inlet channel (12) and a water outlet channel (13) connected to the central flow channel; the upper end of the valve body (1) is provided with a pressure regulating chamber (14), wherein the pressure regulating chamber (14) is provided with a pressure regulating assembly (6); the water outlet channel (13) is provided with a water outlet connector (3), wherein the end of the water outlet connector (3) facing the valve body (1) is provided with a one-way valve assembly; wherein: The lower end of the valve body (1) is provided with a mounting channel connected to the central flow channel; the mounting channel comprises an upper channel (151) and a lower channel (152); 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 connecting the pressure regulating chamber (14) with the central flow channel, a pressure relief hole (19) for connecting the pressure relief chamber (20) with the outside, a first channel (16) for connecting the water inlet channel (12) with the lower channel (152), and a second channel (17) for connecting the pressure regulating chamber (14) with the water outlet channel (13); It also includes a pressure relief assembly, which includes a pressure relief valve seat (54), a return spring (53), a push rod (51) and a base (52); wherein the pressure relief valve seat (54) is installed at the connection between the central flow 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 fitted and slidable with the lower channel (152), and the upper end abuts against the pressure relief valve seat (54) The push rod (51) is located at the center hole of the upper channel (151); an upper ring platform (55) is provided on the side wall of the push rod (51); the upper ring platform (55) and the upper channel (151) are fitted and slidable; the return spring (53) is located in the upper channel (151) and is sleeved on the push rod (51); the upper end of the return spring (53) abuts against the upper limit platform (153) at the upper end of the upper channel (151), and the lower end abuts against the upper ring platform (55).

2. A zero pressure maintaining pressure regulating valve according to claim 1, characterized in that: The one-way valve assembly comprises a cone valve (42), a cone valve seat (41) and a second spring (43); The water outlet joint (3) has a mounting groove at its left end and a connecting port at its right end, and the mounting groove is in communication with the connecting port; The cone valve seat (41) is arranged in close contact with the left end of the water outlet channel (13), and an opening is arranged on the side wall of the cone valve seat (41) at a position corresponding to the second channel (17); The cone valve (42) is slidably arranged in the installation groove, the left end of the cone valve (42) extends into the cone valve seat (41), and the right end is penetrated by a flow passage, and a flow hole communicating with the flow passage is opened on the side wall of the cone valve (42); the second spring (43) is arranged in the installation groove, and one end abuts against the cone valve (42), and the other end abuts against the installation groove; In a natural state, the cone valve (42) is pushed by the second spring (43) and the left end abuts against the cone valve seat (41).

3. A zero pressure maintaining pressure regulating valve according to claim 2, characterized in that: 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).

4. The zero pressure maintaining pressure regulating valve according to claim 1 is characterized in that: A pressure-inducing channel (511) is provided in the middle of the push rod (51), and a pressure-inducing hole (512) for connecting the central channel (11) and the pressure-inducing channel (511) is provided on the side wall of the push rod (51).

5. A zero pressure maintaining pressure regulating valve according to claim 4, characterized 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 that slidably cooperates with the sleeve hole; the sleeve hole is connected to the pressure-inducing channel (511).

6. The zero pressure maintaining pressure regulating valve according to claim 1 is characterized in that: When the upper end of the push rod (51) abuts against the pressure relief valve seat (54), a pressure relief gap is formed between the two.

7. The zero pressure maintaining pressure regulating valve according to claim 1 is characterized in that: The cross-sectional area of ​​the lower end of the push rod (51) is larger than the cross-sectional area of ​​the upper end.

8. The zero pressure maintaining pressure regulating valve according to claim 1, characterized in that: The valve body (1) is also provided with a third channel (18) for connecting the upper channel (151) and the water outlet channel (13).

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