Pressure reducer with protection and pressure relief functions

Abstract

The utility model discloses a pressure reducer with protective pressure relief function, which comprises a valve body, an upper cover and a piston, one end of the valve body is provided with an air inlet, a nozzle and a high-pressure air cavity are arranged in the valve body, the bottom of the piston is provided with a valve clack, the valve clack corresponds to the top of the nozzle, the piston is provided with a pressure relief hole, and the pressure relief hole is communicated with the upper cover. One end of the pressure relief hole is communicated with the low-pressure air cavity, the other end of the pressure relief hole is communicated with the pressure balance cavity, a rubber plug is arranged on the pressure relief hole, the rubber plug is in interference fit with the pressure relief hole, when sealing of the valve clack fails, air of an air source continuously enters the low-pressure air cavity through the air inlet, and the pressure balance cavity is communicated with the low-pressure air cavity. When the pressure of the gas in the low-pressure gas cavity is gradually increased and reaches a certain limit value, the rubber plug is pushed to fall off, so that the low-pressure gas cavity is communicated with the atmosphere, and the pressure of the gas in front of the gas outlet is relieved, so that external equipment is prevented from being damaged due to overlarge pressure impact, and a user is prevented from being injured.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure gas pressure reduction control, in particular to a pressure reducer with a protective pressure relief function. Background Art

[0002] There are many types of piston pressure reducers on the market, but they generally have the problem of single functionality. They only have the function of reducing the pressure on the incoming gas, but do not have a safety protection function. For example, when the seal at the bottom of the piston fails, the air inlet cannot be sealed and continues to take in air, which will cause the gas pressure in the air cavity above the piston to continue to increase. At this time, when the user connects to an external device and opens the air outlet, the equipment may be damaged or the user may be injured due to excessive outlet pressure.

[0003] How to realize that the piston type pressure reducer can have the pressure reducing function and the pressure relief protection function at the same time is an urgent problem to be solved. Summary of the invention

[0004] The utility model provides a pressure reducer with a protective pressure relief function to overcome the above technical problems.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A pressure reducer with a protective pressure relief function, comprising a valve body, an upper cover and a piston, wherein the upper cover is arranged on the upper side of the valve body, and the piston is arranged inside a cavity formed by the valve body and the upper cover;

[0007] An air inlet is provided at one end of the valve body, a nozzle and a high-pressure air cavity are provided inside the valve body, one end of the high-pressure air cavity is connected to the air inlet, and the other end of the high-pressure air cavity is connected to one end of the nozzle, a nozzle cavity wall is provided around the nozzle, and a nozzle cavity is formed between the nozzle cavity wall, the nozzle and the piston;

[0008] A valve flap is provided at the bottom of the piston, the valve flap corresponds to the top of the nozzle, a low-pressure air cavity is formed between the top of the piston and the upper cover, one end of the low-pressure air cavity is connected to the air outlet, and the other end of the low-pressure air cavity is connected to the nozzle cavity, a pressure balance cavity is formed between the inner wall of the valve body, the nozzle cavity wall and the piston, and the balance cavity is connected to the atmosphere;

[0009] The piston is provided with a pressure relief hole, one end of which is connected to the low-pressure air chamber, and the other end of which is connected to the pressure balance chamber. A rubber plug is provided on the pressure relief hole, and the rubber plug is interference-connected with the pressure relief hole.

[0010] Furthermore, it also includes a first spring, which is arranged in the pressure balance chamber.

[0011] Furthermore, a vent hole is provided at the lower portion of the piston, one end of the vent hole is connected to the nozzle chamber, and the other end of the vent hole is connected to the low-pressure air chamber.

[0012] Furthermore, it also includes a first sealing ring and a second sealing ring, the first sealing ring is arranged between the piston and the nozzle chamber wall, the first sealing ring is arranged on the upper side of the vent hole, and the second sealing ring is arranged between the piston and the inner wall of the upper cover, and the piston is slidingly sealed and connected to the nozzle chamber wall and the inner wall of the upper cover through the first sealing ring and the second sealing ring.

[0013] Furthermore, a connecting hole is provided on the outer wall of the valve body, one end of the connecting hole is connected to the pressure balance chamber, and the other end of the connecting hole is connected to the atmosphere, and the number of the connecting hole is at least one.

[0014] Furthermore, it also includes a sealing rubber ring, the side wall of the top end of the piston is provided with the pressure relief hole, and the sealing rubber ring is movably arranged in the pressure relief hole.

[0015] Furthermore, it also includes a fixed seat and a second spring, the pressure relief hole is opened at the top of the piston, the fixed seat is arranged in the pressure relief hole, the bottom end of the fixed seat is provided with a pressure relief outlet, one end of the pressure relief outlet is connected with the pressure relief hole, the other end of the pressure relief outlet is connected with the pressure balance chamber, the second spring is arranged inside the fixed seat, and the rubber plug is arranged on the upper side of the second spring.

[0016] Furthermore, the valve body and the upper cover are connected by threaded connection.

[0017] Beneficial effect: The utility model discloses a pressure reducer with a protective pressure relief function, in which an air inlet is connected to an external air source, and the air from the air source passes through the high-pressure air chamber, the nozzle and the nozzle chamber in sequence into the low-pressure air chamber to achieve pressure reduction and air supply. At this time, the gas pressure in the low-pressure air chamber increases, pushing the piston to move downward, so that the valve flap and the nozzle are sealed, and the gas no longer flows into the low-pressure air chamber. When the valve flap seal fails, the air from the air source continues to enter the low-pressure air chamber through the air inlet. When the gas pressure in the low-pressure air chamber gradually increases and reaches a certain limit, the rubber plug is pushed to fall off, and the rubber plug is separated from the piston, so that the low-pressure air chamber is connected to the atmosphere, thereby achieving pressure relief for the gas in front of the air outlet, thereby avoiding damage to external equipment due to excessive pressure shock, and avoiding injuries to users due to excessive outlet pressure. The present application improves the safety of the use of the pressure reducer and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a pressure reducer with a protective pressure relief function disclosed in an embodiment of the utility model;

[0020] Figure 2 It is a cross-sectional view of a pressure reducer with a protective pressure relief function disclosed in Example 1 of the utility model;

[0021] Figure 3 A gas flow diagram of a pressure reducer with a protective pressure relief function disclosed in Example 1 of the utility model when pressure relief fails;

[0022] Figure 4 It is a cross-sectional view of a pressure reducer with a protective pressure relief function disclosed in Example 2 of the utility model;

[0023] Figure 5 for Figure 4 A partial enlarged view of part C in the middle;

[0024] Figure 6 It is a cross-sectional view of a pressure reducer with a protective pressure relief function disclosed in Example 3 of the utility model;

[0025] Figure 7 for Figure 6 A partial enlarged view of part D in the middle;

[0026] In the figure: 1. valve body; 11. air inlet; 12. nozzle; 13. nozzle cavity wall; 14. connecting hole; 100. high-pressure air cavity; 2. upper cover; 21. air outlet; 200. low-pressure air cavity; 3. piston; 31. valve disc; 32. rubber plug; 32a. sealing rubber ring; 32b1. fixing seat; 32b2. second spring; 32b3. pressure relief air outlet; 33. first sealing ring; 34. second sealing ring; 35. air vent; 36. pressure relief hole; 300. nozzle cavity; 4. first spring; 400. pressure balance cavity. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] Example 1

[0029] This embodiment provides a pressure reducer with a protective pressure relief function, such as Figure 1-3 As shown, it comprises a valve body 1, an upper cover 2 and a piston 3, wherein the upper cover 2 is arranged on the upper side of the valve body 1, and the piston 3 is arranged inside a cavity formed by the valve body 1 and the upper cover 2, the upper end of the piston 3 has a larger diameter, and the lower end of the piston 3 has a smaller diameter, the large diameter end of the piston 3 is located at the upper cover 2, and the small diameter end of the piston 3 is located at the valve body 1;

[0030] An air inlet 11 is provided at one end of the valve body 1, a nozzle 12 and a high-pressure air chamber 100 are provided inside the valve body 1, one end of the high-pressure air chamber 100 is connected to the air inlet 11, and the other end of the high-pressure air chamber 100 is connected to one end of the nozzle 12, a nozzle chamber wall 13 is provided around the nozzle 12, a nozzle chamber 300 is formed between the nozzle chamber wall 13, the nozzle 12 and the small-diameter end of the lower part of the piston 3, and the nozzle chamber 300 is provided inside the valve body 1;

[0031] A valve flap 31 is provided at the bottom small diameter end of the piston 3, and the valve flap 31 corresponds to the top of the nozzle 12. A low-pressure air chamber 200 is formed between the top of the piston 3 and the upper cover 2, and one end of the low-pressure air chamber 200 is connected to the air outlet 21, and the other end of the low-pressure air chamber 200 is connected to the nozzle chamber 300. The low-pressure air chamber 200 is arranged inside the upper cover 2, and a pressure balance chamber 400 is formed between the inner wall of the valve body 1, the nozzle chamber wall 13 and the piston 3, and the balance chamber 400 is connected to the atmosphere;

[0032] The piston 3 is provided with a pressure relief hole 36 , one end of which is connected to the low-pressure air chamber 200 , and the other end of which is connected to the pressure balance chamber 400 . A rubber plug 32 is provided on the pressure relief hole 36 , and the rubber plug 32 is interference-connected with the pressure relief hole 36 .

[0033] In this embodiment, during normal operation, the air inlet 11 is connected to an external air source, the air from the air source enters the high-pressure air chamber 100, and enters the low-pressure air chamber 200 through the nozzle 12 and the nozzle chamber 300, and the gas pressure in the low-pressure air chamber 200 increases instantly. When the gas pressure in the low-pressure air chamber 200 increases to a limit value, the piston 3 is pushed to move downward, so that the valve flap 31 is sealed with the nozzle 12, and the nozzle 12 is in a closed state; when the air outlet 21 is connected to an external device and is opened, the gas pressure in the low-pressure air chamber 200 decreases, the piston 3 moves upward, and the valve flap 31 and the nozzle 12 are out of the sealed state, thereby achieving normal decompression and oxygen supply.

[0034] When the pressure reducer fails due to poor sealing performance of the valve flap 31, Figure 3 As shown, the air inlet 11 is connected to an external air source, and the air source gas enters the high-pressure air chamber 100, and enters the low-pressure air chamber 200 through the nozzle 12 and the nozzle chamber 300. The gas pressure in the low-pressure air chamber 200 increases instantly, pushing the piston 3 to move downward, so that the valve flap 31 contacts the nozzle 12. However, due to the failure of the valve flap 31, it cannot be sealed with the nozzle 12, so that the air source gas continues to enter the low-pressure air chamber 200, resulting in the gas pressure in the low-pressure air chamber 200 becoming larger and larger. When it increases to a certain limit, the rubber plug 32 will be impacted downward and move from A to B and separate from the piston 3. At this time, the low-pressure air chamber 200 is connected to the pressure balance chamber 400, and then to the atmosphere, so as to realize the pressure relief of the low-pressure air chamber 200. When the external device is connected and the air outlet 21 is opened, the external device will not be damaged by the impact due to the excessive gas pressure at the air outlet 21, thereby preventing the user from being injured.

[0035] Once the rubber plug 32 falls off the piston 3, the pressure reducer cannot be used, and a professional must reinstall the rubber plug 32 on the piston 3 before it can be used again.

[0036] In a specific embodiment, a first spring 4 is further included. The first spring 4 is arranged in the pressure balance chamber 400. The first spring 4 provides prestress for the movement of the piston 3 to keep the nozzle 12 and the valve flap 31 disengaged when the pressure reducer is not working.

[0037] In a specific embodiment, a vent hole 35 is provided at the lower small-diameter end of the piston 3 , one end of the vent hole 35 is connected to the nozzle chamber 300 , and the other end of the vent hole 35 is connected to the low-pressure air chamber 200 .

[0038] In a specific embodiment, it also includes a first sealing ring 33 and a second sealing ring 34. The first sealing ring 33 is arranged between the small diameter end of the piston 3 and the nozzle cavity wall 13, the first sealing ring 33 is arranged on the upper side of the vent hole 35, and the second sealing ring 34 is arranged between the large diameter end of the piston 3 and the inner wall of the upper cover 2. The piston 3 is slidingly sealed and connected to the nozzle cavity wall 13 and the inner wall of the upper cover 2 through the first sealing ring 33 and the second sealing ring 34. The first sealing ring 33 and the second sealing ring 34 play a sealing role.

[0039] In a specific embodiment, a connecting hole 14 is opened on the outer wall of the valve body 1, one end of the connecting hole 14 is connected to the pressure balance chamber 400, and the other end of the connecting hole 14 is connected to the atmosphere. The number of the connecting hole 14 is at least one.

[0040] In a specific embodiment, the valve body 1 and the upper cover 2 are connected by threaded connection.

[0041] Example 2

[0042] This embodiment provides a second form of realizing the pressure relief function, such as Figure 4-5 As shown, the side wall of the piston 3 is provided with the pressure relief hole 36, and the side wall of the piston 3 is provided with a mounting groove at a position corresponding to the pressure relief hole 36, and a sealing rubber ring 32a is sleeved in the mounting groove. When the gas pressure in the low-pressure air chamber 200 does not reach a certain limit value, the sealing rubber ring 32a and the pressure relief hole 36 are in a sealed state; when the gas pressure in the low-pressure air chamber 200 reaches a certain limit value, the sealing rubber ring 32a is lifted up, as shown in FIG. Figure 5 As shown, the pressure relief hole 36 is opened, and the gas in the low-pressure air chamber 200 communicates with the atmosphere through the pressure relief hole 36, the pressure balance chamber 400 and the vent hole 14, thereby achieving a pressure relief function. When the gas pressure in the low-pressure air chamber 200 decreases below the limit again, the sealing rubber ring 32a recovers to a sealed state with the pressure relief hole 36 due to its own elasticity.

[0043] The sealing rubber ring 32a in this embodiment can be reused, has low cost and long service life.

[0044] Example 3

[0045] This embodiment provides a third form of realizing the pressure relief function, such as Figure 6-7As shown, the top end surface of the piston 3 is provided with the pressure relief hole 36, the bottom of the pressure relief hole 36 is provided with a mounting groove, a fixing seat 32b1 is provided in the mounting groove, and a pressure relief outlet 32b3 is provided at the bottom of the fixing seat 32b1, and the pressure relief outlet 32b3 is communicated with the pressure balance chamber 400, and a second spring 32b2 is provided inside the fixing seat 32b1, and the rubber plug 32 is provided on the upper side of the second spring 32b2, and the second spring 32b2 is in a compressed state. When the gas pressure in the low-pressure air chamber 200 does not reach a certain limit value, the rubber plug 32 and the pressure relief hole 36 are in a sealed state under the elastic force of the second spring 32b2; when the gas pressure in the low-pressure air chamber 200 reaches a certain limit value, as shown in FIG. Figure 7 As shown, the rubber plug 32 moves downward under the action of the pressure difference, so that the rubber plug 32 is separated from the pressure relief hole 36, and the pressure relief hole 36 is in an open state. The gas in the low-pressure air chamber 200 is connected to the atmosphere through the pressure relief hole 36, the pressure relief outlet 32b3, the pressure balance chamber 400 and the vent 14, thereby realizing the pressure relief function. When the gas pressure in the low-pressure air chamber 200 is reduced to below the limit value again, the rubber plug 32 is restored to a sealed state with the pressure relief hole 36 under the action of the spring force.

[0046] This embodiment can also be reused, with low cost and long service life.

[0047] The implementation form of the pressure relief function of the pressure reducer with protective pressure relief function is not limited to the structures in the three embodiments of the present application. There are many other equivalent forms that can realize the pressure relief function, which will not be described in the present utility model.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A pressure reducer with protective pressure relief function, characterized in that: It comprises a valve body (1), an upper cover (2) and a piston (3), wherein the upper cover (2) is arranged on the upper side of the valve body (1), and the piston (3) is arranged inside a cavity formed by the valve body (1) and the upper cover (2); An air inlet (11) is provided at one end of the valve body (1), a nozzle (12) and a high-pressure air chamber (100) are provided inside the valve body (1), one end of the high-pressure air chamber (100) is connected to the air inlet (11), the other end of the high-pressure air chamber (100) is connected to one end of the nozzle (12), a nozzle chamber wall (13) is provided around the nozzle (12), and a nozzle chamber (300) is formed between the nozzle chamber wall (13), the nozzle (12) and the piston (3); A valve flap (31) is provided at the bottom of the piston (3), and the valve flap (31) corresponds to the top of the nozzle (12). A low-pressure air chamber (200) is formed between the top of the piston (3) and the upper cover (2), one end of the low-pressure air chamber (200) is connected to the air outlet (21), and the other end of the low-pressure air chamber (200) is connected to the nozzle chamber (300). A pressure balance chamber (400) is formed between the inner wall of the valve body (1), the nozzle chamber wall (13) and the piston (3), and the balance chamber (400) is connected to the atmosphere; The piston (3) is provided with a pressure relief hole (36), one end of the pressure relief hole (36) is connected to the low-pressure air chamber (200), and the other end of the pressure relief hole (36) is connected to the pressure balance chamber (400). The pressure relief hole (36) is provided with a rubber plug (32), and the rubber plug (32) is interference-connected with the pressure relief hole (36).

2. A pressure reducer with protective pressure relief function according to claim 1, characterized in that: It also includes a first spring (4), wherein the first spring (4) is arranged in the pressure balance chamber (400).

3. The pressure reducer with protective pressure relief function according to claim 1, characterized in that: A vent hole (35) is provided at the lower portion of the piston (3), one end of the vent hole (35) is connected to the nozzle chamber (300), and the other end of the vent hole (35) is connected to the low-pressure air chamber (200).

4. A pressure reducer with protective pressure relief function according to claim 3, characterized in that: The invention also comprises a first sealing ring (33) and a second sealing ring (34), wherein the first sealing ring (33) is arranged between the piston (3) and the nozzle cavity wall (13), the first sealing ring (33) is arranged on the upper side of the vent hole (35), and the second sealing ring (34) is arranged between the piston (3) and the inner wall of the upper cover (2); the piston (3) is slidingly sealedly connected to the nozzle cavity wall (13) and the inner wall of the upper cover (2) through the first sealing ring (33) and the second sealing ring (34).

5. The pressure reducer with protective pressure relief function according to claim 1, characterized in that: A connecting hole (14) is provided on the outer wall of the valve body (1), one end of the connecting hole (14) is connected to the pressure balance chamber (400), and the other end of the connecting hole (14) is connected to the atmosphere, and the number of the connecting hole (14) is at least one.

6. The pressure reducer with protective pressure relief function according to claim 1, characterized in that: It also includes a sealing rubber ring (32a), the side wall at the top end of the piston (3) is provided with the pressure relief hole (36), the side wall of the piston (3) is provided with a mounting groove at a position corresponding to the pressure relief hole (36), and the sealing rubber ring (32a) is movably arranged in the mounting groove.

7. The pressure reducer with protective pressure relief function according to claim 1, characterized in that: It also includes a fixed seat (32b1) and a second spring (32b2), the top end of the piston (3) is provided with the pressure relief hole (36), the fixed seat (32b1) is provided in the pressure relief hole (36), the bottom end of the fixed seat (32b1) is provided with a pressure relief outlet (32b3), one end of the pressure relief outlet (32b3) is connected to the pressure relief hole (36), and the other end of the pressure relief outlet (32b3) is connected to the pressure balance chamber (400), the fixed seat (32b1) is provided with the second spring (32b2), and the upper side of the second spring (32b2) is provided with the rubber plug (32).

8. The pressure reducer with protective pressure relief function according to claim 1, characterized in that: The valve body (1) and the upper cover (2) are connected in a threaded manner.

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