Two-stage pressure reducing valve capable of preventing sealing ring from falling off

Abstract

The utility model discloses a two-stage pressure reducing valve capable of preventing a sealing ring from falling off. The two-stage pressure reducing valve comprises a valve body, a valve cover, a first-stage pressure reducing executing mechanism and a second-stage pressure reducing executing mechanism, the valve body is provided with an air inlet, a first-stage pressure reduction cavity, a middle channel, a second-stage pressure reduction cavity and an air outlet, the air inlet is formed in one end of the valve body, the air outlet is formed in the other end of the valve body, the first-stage pressure reduction cavity, the middle channel and the second-stage pressure reduction cavity are located between the air inlet and the air outlet, and the middle channel is located between the first-stage pressure reduction cavity and the second-stage pressure reduction cavity. The first-stage pressure reducing cavity is positioned between the air inlet hole and the middle channel; the first-stage pressure reducing cavity and the second-stage pressure reducing cavity can be communicated with the outside, a valve cover is detachably connected to the valve body, and the valve cover is used for isolating the first-stage pressure reducing cavity and the second-stage pressure reducing cavity from the outside; the first-stage pressure reduction executing mechanism is installed at the first-stage pressure reduction cavity. According to the two-stage pressure reducing valve capable of preventing the sealing ring from falling off, the problem that in the prior art, the air leakage risk exists due to the fact that connection between the first-stage pressure reducing chamber and the second-stage pressure reducing chamber is achieved through inserting connection is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pressure reducing valve, concretely relates to a prevent seal ring off type two-stage pressure reducing valve. BACKGROUND

[0002] Chinese patent discloses a kind of application number CN200820097702.6 plug-in compression natural gas two-stage pressure reducing valve, the plug-in compression natural gas two-stage pressure reducing valve includes valve body, end cap, adjusting screw, spring block, adjusting spring, spring washer, film, valve, valve spring and adjusting handle, there is also first-stage pressure reducing chamber, two-stage pressure reducing chamber, low pressure gauge, high pressure gauge, anti-freeze outlet connector, quick connector and "O" type seal ring;Spring block, adjusting spring, spring washer, film, valve and valve spring are installed in first-stage pressure reducing chamber and two-stage pressure reducing chamber, two pressure reducing chambers are communicated by passage hole, adjusting screw is installed in the spring block outside of first-stage pressure reducing chamber, adjusting handle is installed in the spring block outside of two-stage pressure reducing chamber;Low pressure gauge and high pressure gauge are communicated with two-stage pressure reducing chamber and first-stage pressure reducing chamber respectively;Quick connector is communicated with first-stage valve chamber, "O" type seal ring is installed in the concave groove of quick connector;Anti-freeze outlet connector is communicated with two-stage pressure reducing chamber.

[0003] Although the above-mentioned plug-in compression natural gas two-stage pressure reducing valve can realize the plug-in connection between the first-stage pressure reducing chamber and the two-stage pressure reducing chamber, the plug-in compression natural gas two-stage pressure reducing valve still has the following shortcomings: due to the gap at the plug-in part, it is easy to cause gas leakage, which reduces the safety. UTILITY MODEL CONTENTS

[0004] The utility model provides a prevent seal ring off type two-stage pressure reducing valve, solves the problem that the connection between the first-stage pressure reducing chamber and the two-stage pressure reducing chamber is realized by plug-in in the prior art, which causes the risk of gas leakage.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The utility model discloses a prevent sealed ring to fall off formula two -stage pressure reducing valve, include: valve body, valve cover, primary pressure reducing actuating mechanism and secondary pressure reducing actuating mechanism, the valve body is provided with air inlet hole, primary pressure reducing chamber, intermediate passage, secondary pressure reducing chamber and air outlet hole, and the valve body one end is provided with air inlet hole, and the valve body other end is provided with air outlet hole, and primary pressure reducing chamber, intermediate passage and secondary pressure reducing chamber are located between air inlet hole and air outlet hole, and intermediate passage is located between primary pressure reducing chamber and secondary pressure reducing chamber, and primary pressure reducing chamber is located between air inlet hole and intermediate passage, primary pressure reducing chamber and secondary pressure reducing chamber can communicate with the outside, and the valve body is detachably connected with valve cover, and the valve cover is used for isolating primary pressure reducing chamber and secondary pressure reducing chamber with the outside, primary pressure reducing actuating mechanism is installed at primary pressure reducing chamber, and primary pressure reducing actuating mechanism is used for opening and closing primary pressure reducing chamber and air inlet hole communication place, secondary pressure reducing actuating mechanism is installed at secondary pressure reducing chamber, and secondary pressure reducing actuating mechanism is used for opening and closing secondary pressure reducing chamber and primary pressure reducing chamber communication place, and primary pressure reducing actuating mechanism and secondary pressure reducing actuating mechanism are all detachably installed on the valve body through valve cover.

[0007] Preferably, the primary pressure reducing actuating mechanism comprises a primary diaphragm, an opening and closing head, and a first elastic member, the inner wall of the primary pressure reducing chamber has a first protruding ring, the first protruding ring communicates the primary pressure reducing chamber with the air inlet hole, the primary diaphragm seals the primary pressure reducing chamber, the primary diaphragm is detachably installed on the valve body through the valve cover, the opening and closing head is installed on the primary diaphragm, the opening and closing head is used for opening and closing the first protruding ring, and the first elastic member is installed between the primary diaphragm and the valve body or the valve cover, and the first elastic member keeps the opening and closing head of the primary diaphragm in the state of opening the first protruding ring.

[0008] Preferably, a sealing mechanism is installed at the first protruding ring, the first sealing ring is installed at the sealing mechanism, the first sealing ring is passed through by the opening and closing head, and the opening and closing head opens and closes the first protruding ring through the first sealing ring.

[0009] Preferably, the sealing mechanism comprises an installation ring, a second sealing ring, and an anti-falling ring, the installation ring is installed on the first protruding ring, the second sealing ring is installed between the installation ring and the inner wall of the first protruding ring, and the first sealing ring is installed on the installation ring through the anti-falling ring.

[0010] Preferably, the installation ring forms a step, the first sealing ring is installed between the step and the anti-falling ring, and the anti-falling ring is in interference fit with the installation ring.

[0011] Preferably, the end of the installation ring close to the valve cover protrudes to form a protruding part, the protruding part is passed through by the opening and closing head, and the protruding part guides the opening and closing head to ascend and descend.

[0012] Preferably, an air outlet hole is formed in the installation ring, and the air outlet hole is located on the side of the first sealing ring close to the primary diaphragm.

[0013] Preferably, the outer wall of the opening and closing head is formed with a conical platform for abutting against the first sealing ring, and the small end of the conical platform is located at the side close to the exhaust hole.

[0014] Preferably, the secondary pressure reducing actuator comprises a secondary diaphragm, a pulling head, a rotating arm and a second elastic member, the inner wall of the secondary pressure reducing cavity is protruded with a second protruding ring, the inner hole of the second protruding ring communicates the secondary pressure reducing cavity with the primary pressure reducing cavity, the secondary diaphragm seals the secondary pressure reducing cavity, the secondary diaphragm is detachably installed on the valve body through the valve cover, the pulling head is installed on the secondary diaphragm, the pulling head hooks one end of the rotating arm, the middle part of the rotating arm is rotatably installed in the secondary pressure reducing cavity, the other end of the rotating arm is used for opening and closing the second protruding ring, the second elastic member is installed between the secondary diaphragm and the valve body or the valve cover, and the second elastic member keeps the rotating arm hooked by the pulling head of the secondary diaphragm in the state of opening the inner hole of the second protruding ring.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1) In the application, when the air pressure is too large, the primary pressure reducing actuator and the secondary pressure reducing actuator can realize pressure reduction, and the pressure reduction effect is better.

[0017] 2) The primary pressure reducing cavity and the secondary pressure reducing cavity can be externally leaked, thereby laying a foundation for externally installing the primary pressure reducing actuator and the secondary pressure reducing actuator during installation, and finally realizing the detachable installation of the primary pressure reducing actuator and the secondary pressure reducing actuator and the valve body through the valve cover, so that the installation operation is simple and convenient.

[0018] Other advantages, objects and features of the utility model will be embodied partly through the following description, and will be understood by those skilled in the art through research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Structure diagram of the double-stage pressure reducing valve for preventing the sealing ring from falling off.

[0020] Figure 2 Sectional view of the double-stage pressure reducing valve for preventing the sealing ring from falling off.

[0021] Figure 3 is Figure 2 Enlarged view of A in the middle.

[0022] Valve body 1, air inlet hole 11, primary pressure reduction cavity 12, intermediate passage 13, secondary pressure reduction cavity 14, air outlet hole 15, first protruding ring 16, first sealing ring 161, mounting ring 162, second sealing ring 163, anti-dropping ring 164, protruding part 165, exhaust hole 166, second protruding ring 17, valve cover 2, primary pressure reduction actuator 3, primary diaphragm 31, opening and closing head 32, conical table surface 320, first elastic member 33, secondary pressure reduction actuator 4, secondary diaphragm 40, pulling head 41, rotating arm 42, second elastic member 43. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, purposes and effects realized by the utility model more clear and easy to understand, the utility model will be further described below in combination with the drawings and specific embodiments:

[0024] As shown in Figures 1 to 3 The utility model discloses a prevent sealed circle to fall formula two-stage pressure reducing valve, including: valve body 1, valve cover 2, primary pressure reduction actuator 3 and secondary pressure reduction actuator 4, valve body 1 is set with air inlet hole 11, primary pressure reduction cavity 12, intermediate passage 13, secondary pressure reduction cavity 14 and air outlet hole 15, and valve body 1 one end sets air inlet hole 11, and the other end of valve body 1 sets air outlet hole 15, and primary pressure reduction cavity 12, intermediate passage 13 and secondary pressure reduction cavity 14 are located between air inlet hole 11 and air outlet hole 15, and intermediate passage 13 is located between primary pressure reduction cavity 12 and secondary pressure reduction cavity 14, and primary pressure reduction cavity 12 is located between air inlet hole 11 and intermediate passage 13, and primary pressure reduction cavity 12 and secondary pressure reduction cavity 14 can communicate with the outside, and valve body 1 is detachably connected with valve cover 2, and valve cover 2 is used to isolate primary pressure reduction cavity 12 and secondary pressure reduction cavity 14 from the outside, primary pressure reduction actuator 3 is installed at primary pressure reduction cavity 12, and primary pressure reduction actuator 3 is used to open and close primary pressure reduction cavity 12 and air inlet hole 11 communication place, secondary pressure reduction actuator 4 is installed at secondary pressure reduction cavity 14, and secondary pressure reduction actuator 4 is used to open and close secondary pressure reduction cavity 14 and primary pressure reduction cavity 12 communication place, and primary pressure reduction actuator 3 and secondary pressure reduction actuator 4 are detachably installed on valve body 1 through valve cover 2.

[0025] The primary pressure reducing actuator 3 comprises a primary diaphragm 31, an opening and closing head 32 and a first elastic member 33. The inner wall of the primary pressure reducing cavity 12 is provided with a first protruding ring 16, and the inner hole of the first protruding ring 16 communicates the primary pressure reducing cavity 12 with the air inlet hole 11. The primary diaphragm 31 closes the primary pressure reducing cavity 12 and is detachably installed on the valve body 1 through the valve cover 2. The opening and closing head 32 is installed on the primary diaphragm 31 and is used to open and close the first protruding ring 16. The first elastic member 33 is installed between the primary diaphragm 31 and the valve body 1 or the valve cover 2, and keeps the opening and closing head 32 of the primary diaphragm 31 in the state of opening the inner hole of the first protruding ring 16. After the valve cover 2 is buckled, the edge of the primary diaphragm 31 is pressed tightly on the valve body 1, so as to realize the isolation of the primary pressure reducing cavity 12 from the outside. At the same time, after the opening and closing head 32 is installed on the primary diaphragm 31, the first elastic member 33 is placed between the primary diaphragm 31 and the valve cover 2, so as to realize the installation of the entire primary pressure reducing actuator 3. The valve cover 2 can position the position of the primary pressure reducing actuator 3, and the installation steps are convenient and simple. The design of the first protruding ring 16 is to realize the communication between the air inlet hole 11 and the primary pressure reducing cavity 12, and to lay the foundation for the execution of the opening and closing action of the primary pressure reducing actuator 3. The above-mentioned primary pressure reducing actuator 3, under the elastic force of the first elastic member 33, presses the opening and closing head 32 away from the valve cover 2, at this time, the opening and closing head 32 is kept in the open state and can naturally ventilate. When the air pressure becomes larger, the primary pressure reducing cavity 12 is larger, and the air pressure in the primary pressure reducing cavity 12 is larger, so that the opening and closing head 32 moves towards the valve cover 2, thereby slowly reducing the opening degree of the first protruding ring 16. Under the condition of larger air pressure, the opening and closing head 32 can also close the inner hole of the first protruding ring 16. Therefore, the position of the opening and closing head 32 is limited by the size of the air pressure in the primary pressure reducing cavity 12. The smaller the opening degree of the first protruding ring 16 is, the closer the opening and closing head 32 is to the valve cover 2, and the smaller the air inlet amount is, thereby achieving the purpose of pressure reduction.

[0026] A sealing mechanism is installed at the first protruding ring 16, and a first sealing ring 161 is installed at the sealing mechanism. The first sealing ring 161 is passed through by the opening and closing head 32, and the opening and closing head 32 opens and closes the inner hole of the first protruding ring 16 by opening and closing the first sealing ring 161. The design of the sealing mechanism is to install the first sealing ring 161. The first sealing ring 161 is extruded by the opening and closing head 32, so as to close the inner hole of the first protruding ring 16, and the closing effect is good.

[0027] The sealing mechanism comprises a mounting ring 162, a second sealing ring 163 and an anti-disengagement ring 164. The mounting ring 162 is mounted on the first protruding ring 16. The second sealing ring 163 is mounted between the mounting ring 162 and the inner wall of the first protruding ring 16. The first sealing ring 161 is mounted on the mounting ring 162 through the anti-disengagement ring 164. The mounting ring 162 is embedded in the first protruding ring 16. The mounting ring 162 does not move relative to the valve body 1 after being mounted. The first sealing ring 161 is mounted on the mounting ring 162 through the anti-disengagement ring 164.

[0028] The mounting ring 162 is formed with a step. The first sealing ring 161 is mounted between the step and the anti-disengagement ring 164. The anti-disengagement ring 164 is in interference fit with the mounting ring 162. The step and the anti-disengagement ring 164 cooperate to position the first sealing ring 161. The anti-disengagement ring 164 does not disengage from the mounting ring 162. The first sealing ring 161 does not displace randomly to cause poor sealing effect after being closed.

[0029] The end of the mounting ring 162 close to the valve cover 2 is protruded to form a protruding portion 165. The inner hole of the protruding portion 165 is for the opening and closing head 32 to pass through. The inner hole of the protruding portion 165 guides the opening and closing head 32 to lift and lower. The inner hole of the protruding portion 165 guides the opening and closing head 32 to lift and lower, avoiding the opening and closing head 32 to move randomly to cause poor sealing effect after being closed.

[0030] An exhaust hole 166 is formed in the mounting ring 162. The exhaust hole 166 is located on the side of the first sealing ring 161 close to the primary sealing ring. Since the end of the mounting ring 162 close to the valve cover 2 is already provided with the protruding portion 165 abutting against the opening and closing head 32, the exhaust hole 166 is needed to be formed on the side wall of the mounting ring 162 to facilitate the gas to pass through the mounting ring 162 into the primary pressure reduction cavity 12.

[0031] The outer wall of the opening and closing head 32 is formed with a conical platform 320 for abutting against the first sealing ring 161. The small end of the conical platform 320 is located on the side close to the exhaust hole 166 of the large end of the conical platform 320. The conical platform 320 is designed to adjust the opening size of the first sealing ring 161 after the opening and closing head 32 moves, thereby adjusting the air intake.

[0032] The secondary pressure reducing actuator 4 comprises a secondary diaphragm 40, a pulling head 41, a rotating arm 42 and a second elastic member 43, the inner wall of the secondary pressure reducing cavity 14 is provided with a second protruding ring 17, the inner hole of the second protruding ring 17 communicates the secondary pressure reducing cavity 14 with the primary pressure reducing cavity 12, the secondary diaphragm 40 closes the secondary pressure reducing cavity 14, the secondary diaphragm 40 is detachably installed on the valve body 1 through the valve cover 2, the pulling head 41 is installed on the secondary diaphragm 40, the pulling head 41 hooks one end of the rotating arm 42, the rotating arm 42 is rotatably installed in the secondary pressure reducing cavity 14 at the middle part, the other end of the rotating arm 42 is used for opening and closing the second protruding ring 17, the second elastic member 43 is installed between the secondary diaphragm 40 and the valve body 1 or the valve cover 2, and the second elastic member 43 keeps the rotating arm 42 hooked by the pulling head 41 on the secondary diaphragm 40 in a state of opening the inner hole of the second protruding ring 17. Under the elastic force of the second elastic member 43, the pulling head 41 pushes the rotating arm 42 away from the second protruding ring 17, at this time, the state of opening the inner hole of the second protruding ring 17 is formed, and the gas can smoothly enter the secondary pressure reducing cavity 14 from the primary pressure reducing cavity 12. When the gas pressure in the secondary pressure reducing cavity 14 is relatively large, the secondary diaphragm 40 moves towards the valve cover 2, drives the rotating arm 42 to rotate, the rotating arm 42 approaches the second protruding ring 17, so that the gas amount entering the secondary pressure reducing cavity is adjusted, and then the purpose of reducing the pressure of the secondary pressure reducing cavity is achieved.

[0033] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A two-stage pressure reducing valve of the type in which a seal ring is prevented from falling out, characterized by The utility model relates to a valve body (1), valve cover (2), primary pressure reduction actuator (3) and secondary pressure reduction actuator (4) are included. The valve body (1) is provided with an air inlet hole (11), a primary pressure reduction cavity (12), an intermediate channel (13), a secondary pressure reduction cavity (14) and an air outlet hole (15), one end of the valve body (1) is provided with the air inlet hole (11), the other end of the valve body (1) is provided with the air outlet hole (15), the primary pressure reduction cavity (12), the intermediate channel (13) and the secondary pressure reduction cavity (14) are located between the air inlet hole (11) and the air outlet hole (15), the intermediate channel (13) is located between the primary pressure reduction cavity (12) and the secondary pressure reduction cavity (14), and the primary pressure reduction cavity (12) is located between the air inlet hole (11) and the intermediate channel (13). The primary pressure reduction cavity (12) and the secondary pressure reduction cavity (14) can communicate with the outside, and the valve cover (2) is detachably connected to the valve body (1), and the valve cover (2) is used for isolating the primary pressure reduction cavity (12) and the secondary pressure reduction cavity (14) from the outside. The primary pressure reduction actuator (3) is installed at the primary pressure reduction cavity (12), and the primary pressure reduction actuator (3) is used for opening and closing the communication place of the primary pressure reduction cavity (12) and the air inlet hole (11). The secondary pressure reduction actuator (4) is installed at the secondary pressure reduction cavity (14), and the secondary pressure reduction actuator (4) is used for opening and closing the communication place of the secondary pressure reduction cavity (14) and the primary pressure reduction cavity (12), and the primary pressure reduction actuator (3) and the secondary pressure reduction actuator (4) are detachably installed on the valve body (1) through the valve cover (2). The primary pressure reduction actuator (3) comprises a primary diaphragm (31), an opening and closing head (32) and a first elastic member (33), the inner wall of the primary pressure reduction cavity (12) is protruded with a first protruding ring (16), the inner hole of the first protruding ring (16) communicates the primary pressure reduction cavity (12) with the air inlet hole (11), the primary diaphragm (31) seals the primary pressure reduction cavity (12), the primary diaphragm (31) is detachably installed on the valve body (1) through the valve cover (2), the opening and closing head (32) is installed on the primary diaphragm (31), the opening and closing head (32) is used for opening and closing the first protruding ring (16), and the first elastic member (33) is installed between the primary diaphragm (31) and the valve body (1) or the valve cover (2), and the first elastic member (33) keeps the opening and closing head (32) on the primary diaphragm (31) in the state of opening the inner hole of the first protruding ring (16).

2. The dual stage pressure reducing valve according to claim 1, wherein A sealing mechanism is installed at the first protruding ring (16), a first sealing ring (161) is installed at the sealing mechanism, the first sealing ring (161) is passed through the opening and closing head (32), and the opening and closing head (32) opens and closes the inner hole of the first protruding ring (16) by opening and closing the first sealing ring (161).

3. The dual stage pressure reducing valve according to claim 2, wherein The sealing mechanism comprises a mounting ring (162), a second sealing ring (163) and an anti-drop ring (164), the mounting ring (162) is installed on the first protruding ring (16), the second sealing ring (163) is installed between the mounting ring (162) and the inner wall of the first protruding ring (16), and the first sealing ring (161) is installed on the mounting ring (162) through the anti-drop ring (164).

4. The dual stage pressure reducing valve according to claim 3, wherein ​ 5. The dual stage pressure reducing valve according to claim 4, wherein The mounting ring (162) is formed with a step, and the first sealing ring (161) is mounted between the step and the anti-drop ring (164), and the anti-drop ring (164) is in interference fit with the mounting ring (162).

6. The dual stage pressure reducing valve according to claim 5, wherein The end of the mounting ring (162) close to the valve cover (2) is protruded to form a protruding portion (165), and the inner hole of the protruding portion (165) is used for passing through the opening and closing head (32), and the inner hole of the protruding portion (165) guides the opening and closing head (32) to lift and drop.

7. The dual stage pressure reducing valve according to claim 6, wherein An exhaust hole (166) is arranged on the mounting ring (162), and the exhaust hole (166) is located on the side close to the first sealing ring (161) of the first sealing ring (161).

8. The anti-seal-ring-drop type two-stage pressure reducing valve according to claim 7, wherein The outer wall of the opening and closing head (32) is formed with a conical platform (320) for abutting against the first sealing ring (161), and the small end of the conical platform (320) is located on the side close to the exhaust hole (166) of the large end of the conical platform (320).

9. The dual stage pressure reducing valve according to any one of claims 1 to 8, wherein The secondary pressure reducing actuator (4) comprises a secondary diaphragm (40), a pulling head (41), a rotating arm (42) and a second elastic member (43), the inner wall of the secondary pressure reducing cavity (14) is protruded with a second protruding ring (17), the inner hole of the second protruding ring (17) communicates the secondary pressure reducing cavity (14) with the primary pressure reducing cavity (12), the secondary diaphragm (40) closes the secondary pressure reducing cavity (14), the secondary diaphragm (40) is detachably mounted on the valve body (1) through the valve cover (2), the pulling head (41) is mounted on the secondary diaphragm (40), the pulling head (41) hooks one end of the rotating arm (42), the rotating arm (42) is rotatably mounted in the secondary pressure reducing cavity (14), the other end of the rotating arm (42) is used for opening and closing the second protruding ring (17), the second elastic member (43) is mounted between the secondary diaphragm (40) and the valve body (1) or the valve cover (2), and the second elastic member (43) keeps the rotating arm (42) hooked by the pulling head (41) on the secondary diaphragm (40) in the state of opening the inner hole of the second protruding ring (17).

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