An adaptive back pressure valve

Abstract

The present invention belongs to the technical field of compressors and discloses an adaptive back-pressure valve, comprising a housing, a valve seat, a valve body, a valve core, a first elastic member, a second elastic member, and a pressure-sensitive element. A second accommodating chamber is provided in the valve body, the second accommodating chamber being in communication with an input channel. An output channel is provided on the side wall of the valve body, the two ends of the output channel being in communication with a first outlet and the second accommodating chamber, respectively. The valve core is slidably disposed in the second accommodating chamber. The first elastic member is disposed in the second accommodating chamber and can drive the valve core to block the input channel. The second elastic member is disposed in the first accommodating chamber, one end of the second elastic member abuts the valve seat. The pressure-sensitive element is slidably disposed in the first accommodating chamber, the pressure-sensitive element abuts the other end of the second elastic member, and the output end of the pressure-sensitive element abuts the other end of the first elastic member. The adaptive back-pressure valve enables the back-pressure chamber pressure to be adaptively adjusted according to the suction chamber pressure and the discharge chamber pressure, thereby ensuring stable operation of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular to an adaptive back pressure valve. Background Art

[0002] In order to improve reliability and reduce noise, existing compressors generally use back pressure support technology, such as Figure 1 As shown, a throttle element 6 is provided between the exhaust chamber 5 and the back-pressure chamber 2, and a back-pressure valve 1 is provided between the back-pressure chamber 2 and the suction chamber 7. In the back-pressure valve 1, one side of the ball is subjected to the gas force of the back-pressure chamber 2, and the other side of the ball is subjected to the spring preload and the gas force of the suction chamber 7. When the difference between the gas force of the back-pressure chamber 2 and the pressure of the suction chamber 7 exceeds the spring preload, the actuation pressure differential set value of the back-pressure valve 1 is reached, the ball will shift, and the valve port will open. When the compressor is operating, the high-pressure gas in the exhaust chamber 5 is reduced in pressure by the throttle element 6 and flows into the back-pressure chamber 2, causing the pressure in the back-pressure chamber 2 to rise. When the difference between the pressure of the back-pressure chamber 2 and the pressure of the suction chamber 7 exceeds the actuation pressure differential set value of the back-pressure valve 1, the valve port of the back-pressure valve 1 opens, and the high-pressure gas in the back-pressure chamber 2 is discharged into the suction chamber 7. In this way, the pressure differential between the back-pressure chamber 2 and the suction chamber 7 is controlled to be close to the actuation pressure differential value of the back-pressure valve 1. However, the pressure of the back-pressure chamber 2 in the existing back-pressure valve 1 is only related to the pressure of the suction chamber 7, and has nothing to do with the pressure of the exhaust chamber 5. When the pressure variation range of the exhaust chamber 5 is large, such as the exhaust pressure of the compressor changes from 0.6Mpa to 1.3Mpa, the axial force on the side of the profile of the moving disc 3 will increase, resulting in insufficient pressure on the back of the moving disc 3, causing the moving disc 3 and the static disc 4 to separate, and normal gas compression cannot be performed.

[0003] Therefore, there is an urgent need for an adaptive back pressure valve to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide an adaptive back-pressure valve, so that the pressure of the back-pressure chamber can be adaptively adjusted according to the pressure of the suction chamber and the pressure of the exhaust chamber.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] An adaptive back pressure valve, comprising:

[0007] a housing, wherein a first accommodating cavity is provided in the housing, a first inlet is provided at one end of the housing, a second inlet is provided at the other end of the housing, a first outlet is provided at a side wall of the housing, and the first inlet, the second inlet, and the first outlet are all in communication with the first accommodating cavity;

[0008] a valve seat, the valve seat being disposed in the first accommodating chamber and located between the first inlet and the first outlet, the valve seat being provided with an input channel, one end of the input channel being in communication with the first inlet;

[0009] a valve body, the valve body being disposed in the first accommodating chamber, one end of the valve body being connected to the valve seat, a second accommodating chamber being defined within the valve body, the second accommodating chamber being communicated with the input channel, an output channel being defined on a side wall of the valve body, the two ends of the output channel being communicated with the first outlet and the second accommodating chamber, respectively;

[0010] a valve core, the valve core being slidably disposed in the second accommodating cavity and capable of blocking the input channel;

[0011] a first elastic member, the first elastic member being disposed in the second accommodating cavity, one end of the first elastic member being in contact with the valve core, and the first elastic member being capable of driving the valve core to block the input channel;

[0012] a second elastic member, the second elastic member being disposed in the first accommodating cavity, one end of the second elastic member being in contact with the valve seat;

[0013] A pressure-sensitive element is slidably disposed in the first accommodating cavity and is located between the second inlet and the first outlet. The pressure-sensitive element abuts against the other end of the second elastic member, and the output end of the pressure-sensitive element abuts against the other end of the first elastic member.

[0014] Preferably, a pad is slidably provided in the second accommodating cavity, one end of the pad abuts against the other end of the first elastic member, and the other end of the pad abuts against the output end of the pressure-sensitive element.

[0015] Preferably, a bracket is slidably provided in the second accommodating cavity, one end of the bracket abuts against the valve core, and the other end abuts against one end of the first elastic member.

[0016] Preferably, one end of the bracket is provided with an arc surface, and the arc surface is arranged to fit the valve core.

[0017] Preferably, a first boss is provided at the other end of the bracket, and one end of the first elastic member is sleeved on the first boss.

[0018] Preferably, the input channel is provided with a filter.

[0019] Preferably, a first annular groove is provided in the second inlet, a first sealing element is embedded in the first annular groove, and the first sealing element is in contact with the input end of the pressure-sensitive element.

[0020] Preferably, one end of the second elastic member is sleeved on the valve body, one end of the pressure-sensitive element is provided with a second boss, and the other end of the second elastic member is sleeved on the second boss.

[0021] Preferably, the first elastic member is a preload spring, and the second elastic member is a support spring.

[0022] Preferably, the side wall of the shell is provided with a second annular groove and a third annular groove, the second annular groove and the third annular groove are located on both sides of the first outlet, a second sealing element is embedded in the second annular groove, and a third sealing element is embedded in the third annular groove.

[0023] Beneficial effects of the present invention:

[0024] When the pressure difference between the exhaust chamber pressure and the suction chamber pressure is less than the preset pressure difference, the second elastic member presses the pressure-sensitive element to the other end of the shell, and the operating pressure difference of the adaptive back-pressure valve is determined by the stiffness and pre-compression of the first elastic member. When the pressure difference between the exhaust chamber pressure and the suction chamber pressure is greater than the preset pressure difference, the gas force will overcome the pre-tightening force of the second elastic member, and the pressure-sensitive element will slide in the first accommodating chamber, and the pressure-sensitive element pushes the first elastic member to shrink in the direction close to the valve core through the output end. The shrinkage displacement increases the pre-compression amount and pre-tightening force of the first elastic member, thereby increasing the operating pressure difference setting value of the adaptive back-pressure valve, so that the back-pressure chamber pressure can be adaptively adjusted according to the suction chamber pressure and the exhaust chamber pressure, thereby preventing the moving disk and the static disk from separating, and ensuring that the compressor performs normal gas compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in describing the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0026] Figure 1 It is a structural diagram of an existing compressor;

[0027] Figure 2 It is a structural schematic diagram of the adaptive back pressure valve provided by the present invention.

[0028] In the picture:

[0029] 1. Back pressure valve; 2. Back pressure chamber; 3. Moving disc; 4. Static disc; 5. Exhaust chamber; 6. Throttle element; 7. Suction chamber;

[0030] 100. Shell; 101. First accommodating chamber; 102. First inlet; 103. Second inlet; 1031. First annular groove; 1032. First sealing element; 104. First outlet; 105. Second annular groove; 106. Second sealing element; 107. Third annular groove; 108. Third sealing element; 200. Valve seat; 201. Input channel; 202. Filter; 300. Valve body; 301. Second accommodating chamber; 302. Output channel; 303. Spacer; 304. Bracket; 3041. Arc surface; 3042. First boss; 400. Valve core; 500. First elastic member; 600. Second elastic member; 700. Pressure-sensitive member; 701. Second boss. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0032] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0037] like Figure 2 Shown and see Figure 1 The present embodiment provides an adaptive back pressure valve, comprising a housing 100, a valve seat 200, a valve body 300, a valve core 400, a first elastic member 500, a second elastic member 600 and a pressure sensing element 700, wherein a first accommodating chamber 101 is provided in the housing 100, a first inlet 102 is provided at one end of the housing 100, and the first inlet 102 can be used to connect to the back pressure chamber 2 of the compressor, a second inlet 103 is provided at the other end of the housing 100, and the second inlet 103 can be used to connect to the exhaust chamber 5 of the compressor, and the side of the housing 100 is provided with a first accommodating chamber 101. The wall is provided with a first outlet 104, which can be used to connect to the suction chamber 7 of the compressor. The first inlet 102, the second inlet 103 and the first outlet 104 are all connected to the first accommodating chamber 101. The valve seat 200 is arranged in the first accommodating chamber 101, and the valve seat 200 is located between the first inlet 102 and the first outlet 104. The valve seat 200 is provided with an input channel 201, one end of the input channel 201 is connected to the first inlet 102, and the valve body 300 is arranged in the first accommodating chamber 101, and one end of the valve body 300 is connected to the first inlet 102. The valve body 300 is connected to the valve seat 200. A second accommodating chamber 301 is defined in the valve body 300. The second accommodating chamber 301 communicates with the other end of the input channel 201. An output channel 302 is defined on the side wall of the valve body 300. One end of the output channel 302 communicates with the second accommodating chamber 301, and the other end of the output channel 302 communicates with the first outlet 104. The valve core 400 is slidably disposed in the second accommodating chamber 301, and the valve core 400 can block the input channel 201. The first elastic member 500 is disposed in the second accommodating chamber 301. The first elastic member 500 One end of the first elastic member 500 abuts against the valve core 400, the first elastic member 500 can drive the valve core 400 to block the input channel 201, the second elastic member 600 is arranged in the first accommodating chamber 101, one end of the second elastic member 600 abuts against the valve seat 200, the pressure-sensing element 700 is slidably arranged in the first accommodating chamber 101, and the pressure-sensing element 700 is located between the second inlet 103 and the first outlet 104, the pressure-sensing element 700 abuts against the other end of the second elastic member 600, and the output end of the pressure-sensing element 700 abuts against the other end of the first elastic member 500.

[0038] The adaptive back-pressure valve provided in this embodiment, when in use, the first inlet 102 is communicated with the back-pressure chamber 2, the second inlet 103 is communicated with the exhaust chamber 5, and the first outlet 104 is communicated with the suction chamber 7. When the pressure difference between the exhaust chamber 5 and the suction chamber 7 is less than the preset pressure difference, the second elastic member 600 presses the pressure-sensitive element 700 against the other end of the housing 100. The action pressure difference of the adaptive back-pressure valve is determined by the stiffness and pre-compression amount of the first elastic member 500. When the pressure difference between the exhaust chamber 5 and the suction chamber 7 is greater than the preset pressure difference, the gas force will overcome the pressure difference. Under the preload of the second elastic member 600, the pressure-sensing element 700 slides in the first accommodating chamber 101, and the pressure-sensing element 700 pushes the first elastic member 500 to contract toward the valve core 400 through the output end. The contracted displacement increases the preload and preload of the first elastic member 500, thereby increasing the action pressure difference setting value of the adaptive back-pressure valve, so that the pressure in the back-pressure chamber 2 can be adaptively adjusted according to the pressure in the suction chamber 7 and the pressure in the exhaust chamber 5, thereby preventing the moving disc 3 from separating from the static disc 4, and ensuring normal gas compression of the compressor.

[0039] In this embodiment, a pad 303 is disposed within the second accommodating cavity 301. One end of the pad 303 abuts against the other end of the first elastic member 500, and the other end of the pad 303 is connected to the output end of the pressure-sensitive element 700. The pad 303 provides support for the first elastic member 500, ensuring its stability. It also facilitates the compression of the first elastic member 500 by the pressure-sensitive element 700, ensuring smooth contraction of the first elastic member 500.

[0040] A bracket 304 is also provided within the second accommodating chamber 301. The bracket 304 is slidably disposed within the second accommodating chamber 301. One end of the bracket 304 abuts the valve core 400, and the other end of the bracket 304 abuts one end of the first elastic member 500. The bracket 304 supports the valve core 400, ensuring its stability. It also facilitates the sliding movement of the valve core 400 by the first elastic member 500, ensuring uniform force on the valve core 400.

[0041] Optionally, in a specific embodiment, one end of the bracket 304 is provided with an arcuate surface 3041, which is configured to fit snugly against the valve core 400. The provision of the arcuate surface 3041 prevents the valve core 400 from deviating from the bracket 304 during sliding, allowing the valve core 400 to accurately align with the input channel 201 and ensure that the valve core 400 can successfully block the input channel 201. The other end of the bracket 304 is provided with a first boss 3042, onto which one end of the first elastic member 500 is sleeved. This structure prevents the first elastic member 500 from deviating from the bracket 304 and bouncing open during contraction, thereby ensuring the structural stability of the first elastic member 500.

[0042] In this embodiment, the input channel 201 is provided with a filter 202. The filter 202 prevents impurities in the gas from passing through the adaptive back-pressure valve and entering the compressor's suction chamber 7. This prevents damage to both the adaptive back-pressure valve and the compressor, thereby extending the compressor's service life. For example, the filter 202 can be provided within the input channel 201 or between the input channel 201 and the first inlet 102.

[0043] To prevent high-pressure gas from the exhaust chamber 5 from leaking into the intake chamber 7, in this embodiment, a first annular groove 1031 is defined within the second inlet 103. A first sealing element 1032 is embedded within the first annular groove 1031. The first sealing element 1032 is in contact with the input end of the pressure-sensing element 700. For example, the first sealing element 1032 may be an O-ring. Of course, in other embodiments, the first sealing element 1032 may also be a sealant.

[0044] In this embodiment, one end of the second elastic member 600 is sleeved onto the valve body 300, and one end of the pressure-sensing element 700 is provided with a second boss 701, with the other end of the second elastic member 600 sleeved onto the second boss 701. This structure ensures the stability of the second elastic member 600, preventing it from bouncing off, and ensuring the smooth operation of the adaptive backpressure valve. For example, the first elastic member 500 and the second elastic member 600 can be springs or elastic suspensions, with the first elastic member 500 preferably being a preloaded spring and the second elastic member 600 preferably being a support spring. The pressure-sensing element 700 can be, but is not limited to, cross-shaped.

[0045] In one embodiment, the sidewall of the housing 100 is provided with a second annular groove 105 and a third annular groove 107. The second annular groove 105 and the third annular groove 107 are located on either side of the first outlet 104. A second sealing element 106 is embedded in the second annular groove 105, and a third sealing element 108 is embedded in the third annular groove 107. The provision of the second annular groove 105 and the second sealing element 106 prevents gas from the backpressure chamber 2 from leaking into the suction chamber 7, thereby ensuring the sealing between the backpressure chamber 2 and the suction chamber 7. The provision of the third annular groove 107 and the third sealing element 108 further prevents high-pressure gas from the exhaust chamber 5 from leaking into the suction chamber 7, thereby improving the sealing between the backpressure chamber 2 and the suction chamber 7. By way of example, the second sealing element 106 and the third sealing element 108 may be O-rings. Of course, in other embodiments, the second sealing element 106 and the third sealing element 108 may also be sealant.

[0046] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An adaptive back pressure valve, characterized in that: include: A housing (100), wherein a first accommodating cavity (101) is provided in the housing (100), a first inlet (102) is provided at one end of the housing (100), a second inlet (103) is provided at the other end, a first outlet (104) is provided on a side wall of the housing (100), and the first inlet (102), the second inlet (103) and the first outlet (104) are all in communication with the first accommodating cavity (101); a valve seat (200), the valve seat (200) being disposed in the first accommodating chamber (101) and located between the first inlet (102) and the first outlet (104); the valve seat (200) being provided with an input channel (201), one end of the input channel (201) being in communication with the first inlet (102); A valve body (300), the valve body (300) being arranged in the first accommodating cavity (101), one end of the valve body (300) being connected to the valve seat (200), a second accommodating cavity (301) being provided in the valve body (300), the second accommodating cavity (301) being communicated with the input channel (201), an output channel (302) being provided on a side wall of the valve body (300), the two ends of the output channel (302) being communicated with the first outlet (104) and the second accommodating cavity (301), respectively; a valve core (400), the valve core (400) being slidably disposed in the second accommodating cavity (301), and the valve core (400) being capable of blocking the input channel (201); a first elastic member (500), the first elastic member (500) being disposed in the second accommodating cavity (301), one end of the first elastic member (500) being in contact with the valve core (400), and the first elastic member (500) being capable of driving the valve core (400) to block the input channel (201); a second elastic member (600), the second elastic member (600) being disposed in the first accommodating cavity (101), one end of the second elastic member (600) being in contact with the valve seat (200); A pressure-sensitive element (700) is slidably disposed in the first accommodating cavity (101) and is located between the second inlet (103) and the first outlet (104); the pressure-sensitive element (700) abuts against the other end of the second elastic member (600); and the output end of the pressure-sensitive element (700) abuts against the other end of the first elastic member (500).

2. The adaptive back pressure valve according to claim 1, characterized in that: A cushion block (303) is slidably provided in the second accommodating cavity (301), one end of the cushion block (303) abuts against the other end of the first elastic member (500), and the other end of the cushion block (303) abuts against the output end of the pressure-sensitive element (700).

3. The adaptive back pressure valve according to claim 1, characterized in that: A bracket (304) is slidably provided in the second accommodating cavity (301), one end of the bracket (304) abuts against the valve core (400), and the other end abuts against one end of the first elastic member (500).

4. The adaptive back pressure valve according to claim 3, characterized in that: One end of the bracket (304) is provided with an arc surface (3041), and the arc surface (3041) is arranged to fit the valve core (400).

5. The adaptive back pressure valve according to claim 3, characterized in that: The other end of the bracket (304) is provided with a first boss (3042), and one end of the first elastic member (500) is sleeved on the first boss (3042).

6. The adaptive back pressure valve according to claim 1, characterized in that: The input channel (201) is provided with a filter (202).

7. The adaptive back pressure valve according to claim 1, characterized in that: A first annular groove (1031) is provided in the second inlet (103), a first sealing element (1032) is embedded in the first annular groove (1031), and the first sealing element (1032) is in contact with the input end of the pressure-sensitive element (700).

8. The adaptive back pressure valve according to claim 1, characterized in that: One end of the second elastic member (600) is sleeved on the valve body (300), one end of the pressure-sensing element (700) is provided with a second boss (701), and the other end of the second elastic member (600) is sleeved on the second boss (701).

9. The adaptive back pressure valve according to claim 1, characterized in that: The first elastic member (500) is a preloaded spring, and the second elastic member (600) is a supporting spring.

10. The adaptive back pressure valve according to any one of claims 1 to 9, characterized in that: The side wall of the shell (100) is provided with a second annular groove (105) and a third annular groove (107), the second annular groove (105) and the third annular groove (107) are located on both sides of the first outlet (104), the second annular groove (105) is embedded with a second sealing element (106), and the third annular groove (107) is embedded with a third sealing element (108).

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