Integrated throttle pressure relief valve and compressor including the same

Abstract

The present invention provides an integrated throttle pressure relief valve and a compressor including the same. The integrated throttle pressure relief valve is used to connect to the high-pressure air flow channel of the high-pressure shell of the compressor, and includes a throttle portion, a pressure relief portion, a connector, and a first seal for connecting the throttle pressure relief valve and the high-pressure air flow channel, which are connected in sequence; the throttle portion is provided with a first air flow channel; the pressure relief portion is provided with a hollow cavity with a telescopic structure for accommodating a piston and driving the piston to reciprocate, and at least one second air flow channel connecting the hollow cavity with the space outside the throttle pressure relief valve; when the piston is in the first state, the first air flow channel is not connected to the hollow cavity; when the piston is in the second state, the first air flow channel, the hollow cavity, and the second air flow channel are connected. The integrated throttle pressure relief valve of the present invention integrates the pressure relief function and the throttle function into one component, thereby achieving the effect of reducing parts, saving space, and reducing manufacturing costs.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and in particular to an integrated throttling and pressure relief valve and a compressor comprising the same. Background Art

[0002] The compressor is the core component of the air conditioning system and the power source for the entire system. The compressor compresses the low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure gas. The high-temperature, high-pressure gas then passes through the condenser, throttling device, and evaporator, converting it back into low-temperature, low-pressure gas before returning to the compressor.

[0003] Exhaust pressure is a key technical parameter that requires attention during compressor operation. Excessive exhaust pressure can reduce the safety and reliability of the compressor, shortening its service life. Therefore, when excessive exhaust pressure is detected, it is necessary to relieve the pressure.

[0004] When the compressor is working, there is not only refrigerant but also lubricating oil in the cavity. When the lubricating oil enters the front cavity with the refrigerant, it passes through the oil separation device, and the refrigerant and lubricating oil will be separated. The refrigerant will enter the system to participate in the circulation, and the lubricating oil will pass through the throttling and pressure reduction device and return to the low-pressure cavity of the compressor.

[0005] In the prior art, the throttling and pressure relief functional areas of the compressor are designed independently. The current throttling and pressure relief functions are often achieved by drilling holes in components such as the static scroll and the housing and installing oil return capillaries or throttling bolts. For example, the patent (CN111648962A) discloses a horizontal scroll compressor, in which the throttling device of the compressor is provided with a filter assembly, a threaded column and a base, and throttling is achieved by using a spiral gap channel formed by the threaded column and the base. The throttling mechanism used in the patent is a threaded column. In order to install and fix this threaded column, it is necessary to add a mounting structure to the high and low pressure chamber partition to fix the base where the threaded column is located. The structure is complex, the installation is cumbersome, and the component cost and processing cost are increased. That is, because the throttling effect is related to the area and throttling length of the throttling channel, the throttling mechanism is often complex in form and difficult to manufacture due to the size and structure of the compressor. At the same time, sufficient space is required for the arrangement of such throttling and pressure relief functions, and the throttling mechanism also needs to be fixed with a top screw structure. Such throttling and pressure relief functions are accompanied by high manufacturing costs.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0007] In response to the problems in the prior art, the purpose of the present invention is to provide an integrated throttling pressure relief valve and a compressor including the same. The integrated throttling pressure relief valve can perform both the pressure relief function and the throttling and pressure reduction function, thereby achieving the effect of reducing parts, saving space, and reducing manufacturing costs.

[0008] A first aspect of the present invention provides an integrated throttle pressure relief valve for connecting to a high-pressure air flow passage of a high-pressure housing of a compressor, comprising a throttle portion, a pressure relief portion, a connector for connecting the throttle pressure relief valve and the high-pressure air flow passage, and a first sealing member for sealing the throttle pressure relief valve and the high-pressure air flow passage, which are connected in sequence.

[0009] The throttling portion is provided with a first air flow channel;

[0010] The pressure relief portion is provided with a hollow cavity containing a piston and a telescopic structure for driving the piston to reciprocate, and at least one second air flow channel connecting the hollow cavity and the space outside the throttle pressure relief valve;

[0011] When the piston is in the first state, the first air flow channel is not connected to the hollow cavity;

[0012] When the piston is in the second state, the first air flow channel, the hollow cavity and the second air flow channel are connected.

[0013] According to the first aspect of the present invention, the throttling portion and the pressure relief portion are an integrated piece.

[0014] According to the first aspect of the present invention, the throttle portion and the pressure relief portion are detachably connected.

[0015] According to the first aspect of the present invention, a guide rod is provided at one end of the throttle portion connected to the pressure relief portion, a guide groove adapted to the guide rod is provided at one end of the pressure relief portion connected to the throttle portion, and the throttle portion and the pressure relief portion are connected by an interference fit between the guide rod and the guide groove; or

[0016] A guide rod is provided at one end of the pressure relief part connected to the throttling part, and a guide groove adapted to the guide rod is provided at one end of the throttling part connected to the pressure relief part. The throttling part and the pressure relief part are connected through the interference fit of the guide rod and the guide groove.

[0017] According to the first aspect of the present invention, the connecting member is a first thread, and the first thread is provided on the outer peripheral surface of the throttling portion; and / or

[0018] The connecting piece is a second thread, and the second thread is arranged on the outer peripheral surface of the pressure relief part.

[0019] According to the first aspect of the present invention, the integrated throttling and pressure relief valve further includes a head portion connected to an end of the pressure relief portion facing away from the throttling portion.

[0020] According to the first aspect of the present invention, the first sealing member is an annular elastic member.

[0021] According to the first aspect of the present invention, the first sealing member is sleeved on the pressure relief portion; or

[0022] The first sealing member is sleeved between the pressure relief portion and the head portion.

[0023] According to the first aspect of the present invention, the throttle portion is made of a resin material or a metal material.

[0024] According to the first aspect of the present invention, the integrated throttle and pressure relief valve further comprises a second sealing member;

[0025] The second sealing member is a first annular protrusion structure provided on the hollow cavity, and when the piston is in the first state, the first annular protrusion structure conflicts with an end of the piston facing the first air flow channel; or

[0026] The second sealing member is a second annular protrusion structure provided at one end of the piston facing the first air flow channel. When the piston is in the first state, the second annular protrusion structure contacts the inner wall of the hollow cavity close to the first air flow channel.

[0027] A second aspect of the present invention provides a compressor comprising the integrated throttle and pressure relief valve;

[0028] The high-pressure housing of the compressor is provided with a high-pressure air flow channel and a low-pressure air flow channel;

[0029] The throttle portion is gap-connected to the high-pressure air flow channel, and the low-pressure air flow channel is communicated with the gap between the throttle portion and the high-pressure air flow channel.

[0030] The integrated throttling pressure relief valve of the present invention integrates the pressure relief function and the throttling function into one component, making full use of the space occupied by the pressure relief valve arrangement. There is no need to arrange an additional throttling mechanism, which simplifies the processing and manufacturing process. The whole machine is easy to install and can be used for automated production, greatly reducing manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings herein are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same figure numbers in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0032] Figure 1 is a cross-sectional view of a pressure relief valve according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic structural diagram of a pressure relief valve according to an embodiment of the present invention;

[0034] Figure 3 Schematic diagram of the structure of a throttling portion according to an embodiment of the present invention;

[0035] Figure 4 Schematic diagram of the partial structure of a compressor according to an embodiment of the present invention;

[0036] Figure 5 This is a working state diagram of the pressure relief valve during pressure relief according to one embodiment of the present invention;

[0037] Figure 6 This is a working state diagram of the throttling unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0039] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this specification. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features of different embodiments or examples, described in this specification, unless otherwise mutually incompatible.

[0040] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. Terms indicating relative spaces such as "below" and "above" may be used to more easily explain the relationship of one device relative to another device illustrated in the accompanying drawings. Such terms refer not only to the meaning indicated in the accompanying drawings, but also to other meanings or operations of the device in use. For example, if the device in the accompanying drawings is turned over, a device that was previously described as being "below" another device is described as being "above" the other device. Therefore, the exemplary term "below" includes both above and below. The device can be rotated 90° or other angles, and the terms indicating relative spaces are interpreted accordingly.

[0041] Although the terms first, second, etc. are used herein to represent various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are represented. Furthermore, as used herein, the singular forms "one," "an," and "the" are intended to also include the plural forms, unless the context indicates otherwise. It should be further understood that the terms "comprise" and "include" indicate the presence of the described features, steps, operations, elements, components, items, types, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, types, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C." Exceptions to this definition only occur when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0042] Although not defined differently, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which this specification belongs. Terms defined in commonly used dictionaries are supplementally interpreted as having meanings consistent with relevant technical literature and current knowledge, and unless otherwise defined, they should not be overly interpreted as ideal or highly formalized meanings.

[0043] In order to solve the problems in the prior art, the present invention provides an integrated throttle pressure relief valve for connecting to the high-pressure air flow channel of the high-pressure shell of the compressor, comprising a throttle portion, a pressure relief portion, a connector for connecting the throttle pressure relief valve and the high-pressure air flow channel, and a first seal for sealing the throttle pressure relief valve and the high-pressure air flow channel, which are connected in sequence; the throttle portion is provided with a first air flow channel; the pressure relief portion is provided with a hollow cavity for accommodating a piston and a telescopic structure for driving the piston to reciprocate, and at least one second air flow channel connecting the hollow cavity and the space outside the throttle pressure relief valve; when the piston is in a first state, the first air flow channel is not connected to the hollow cavity; when the piston is in a second state, the first air flow channel, the hollow cavity and the second air flow channel are connected. The integrated throttle pressure relief valve of the present invention can perform both pressure relief and throttling and pressure reduction functions, thereby achieving the effect of reducing parts, saving space and reducing manufacturing costs. In the present invention, "integrated" refers to the throttle pressure relief valve as a valve component that integrates pressure relief and throttling and pressure reduction functions. Specifically, the throttle pressure relief valve may be an integrally formed part or an assembly of multiple parts.

[0044] The structure and working principle of the integrated throttling and pressure relief valve of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of the present invention.

[0045] Figure 1 and Figure 2 They are respectively a cross-sectional view and a structural schematic diagram of a pressure relief valve according to an embodiment of the present invention. Specifically, the integrated throttling pressure relief valve is used to be connected to the high-pressure air flow channel of the high-pressure shell of the compressor, and includes a throttling portion 1, a pressure relief portion 2, a connector for connecting the throttling pressure relief valve and the high-pressure air flow channel of the high-pressure shell, and a first seal 4 for sealing the throttling pressure relief valve and the high-pressure air flow channel of the high-pressure shell.

[0046] The throttling part 1 is provided with a first air flow channel 100; the pressure relief part 2 is provided with a hollow cavity 21 for accommodating a piston 200 and a telescopic structure 300 for driving the reciprocating motion of the piston, and at least one second air flow channel 400 connecting the hollow cavity 21 with the space outside the throttling pressure relief valve.

[0047] When the piston is in the first state, the first air flow channel 100 is not connected to the hollow cavity 21 . Figure 1 In the embodiment, the state of the piston 200 when it is at the upper end of the hollow cavity 21 is the first state. At this time, the end of the piston 200 facing the throttling portion 1 collides with the end face of the hollow cavity 21 at the outlet of the first air flow channel 100. The contact surface between the piston 200 and the hollow cavity 21 has a high degree of flatness. When colliding, the communication channel between the first air flow channel 100 and the hollow cavity 21 is cut off.

[0048] In order to ensure that the passage between the first air flow passage 100 and the hollow cavity 21 is disconnected when the piston 200 contacts the end surface of the hollow cavity 21, the integrated throttle pressure relief valve further includes a second sealing member. Figure 1 As shown, the second sealing member is a first annular protrusion structure 500 provided on the hollow cavity, and when the piston is in the first state, the first annular protrusion structure 500 conflicts with the end of the piston facing the first air flow channel; in some other embodiments, the second sealing member may be a second annular protrusion structure provided on the end of the piston facing the first air flow channel, and when the piston is in the first state, the second annular protrusion structure conflicts with the inner wall of the hollow cavity close to the first air flow channel.

[0049] When the piston is in the second state, the first air flow channel 100 , the hollow cavity 21 and the second air flow channel 400 are connected. Figure 1 In the embodiment, when one end of the piston 200 facing the throttling portion 1 does not conflict with the end face of the hollow cavity 21 at the outlet of the first air flow channel 100, it is the second state of the piston. At this time, the first air flow channel 100 is connected with the upper space of the hollow cavity 21. At the same time, the lower space of the hollow cavity 21 is connected with the second air flow channel 400 through the gap between the piston 200 and the hollow cavity 21. It can be seen that the second state of the piston is the pressure relief state.

[0050] The telescopic structure 300 of the present invention can be a spring, a rubber elastic material, a pipe expander, or the like. Any telescopic structure capable of driving a piston to reciprocate within a hollow cavity can be used in the present invention. Furthermore, when the pressure in the compressor's high-pressure airflow channel is less than a critical pressure, the elastic force of the telescopic structure must be able to force one end of the piston 200 into contact with the end face of the hollow cavity 21. When the pressure in the high-pressure airflow channel of the compressor's high-pressure housing exceeds the critical pressure, the pressure in the airflow channel must be able to overcome the elastic force of the telescopic structure, preventing one end of the piston from contacting the end face of the hollow cavity 21.

[0051] The pressure relief portion and the throttling portion of the integrated throttling pressure relief valve can be integrally formed, that is, the throttling portion and the pressure relief portion are an integral part, and the throttling portion and the pressure relief portion are fixedly connected. The integrated throttling pressure relief valve can be connected to the high-pressure air flow channel of the high-pressure shell of the compressor through a connecting piece. The connecting piece can be a first thread 32 provided on the outer circumferential surface of the throttling portion, and it is compatible with the thread in the air flow channel of the high-pressure shell of the compressor. The connecting piece can also be a second thread 31 provided on the outer circumferential surface of the pressure relief portion, and it is compatible with the thread in the air flow channel of the high-pressure shell of the compressor.

[0052] When both the throttle portion 1 and the pressure relief portion 2 are provided with threaded connectors, they are divided into two functional areas, the first thread 32 area of ​​the throttle portion and the second thread 31 area of ​​the pressure relief portion 2. When the compressor is operating normally, due to the clearance fit between the throttle portion and the high-pressure airflow channel (discussed below), the high-pressure gas causes the throttle portion to tend to move toward the pressure relief portion. Preferably, the second thread 31 area of ​​the pressure relief portion 2 serves as the area for fixing the integrated throttle pressure relief valve to the high-pressure airflow channel. At this time, the pressure relief portion 2 acts as a limiter on the throttle portion 1, ensuring that the throttle portion 1 remains relatively stationary when subjected to high exhaust pressure, and does not damage the throttling structure. In order to better fix the throttle relief valve in the high-pressure airflow channel of the compressor, the diameter of the pressure relief portion 2 can be designed to be greater than or equal to the diameter of the throttle portion 1. At this time, the diameter of the second thread 31 is greater than or equal to the diameter of the first thread 32. In actual use, the length of the second thread 31 of the pressure relief valve can be appropriately increased so that the threaded area of ​​the pressure relief portion further plays the role of fixing and connecting the high-pressure airflow channel.

[0053] The first sealing member 4 can be an annular elastic member, and the first sealing member 4 can be sleeved on the pressure relief part 2. The first sealing member 4 can be made of an elastic rubber material, such as an O-ring or a sealing gasket. The sealing method of the high-pressure air flow channel between the throttle pressure relief valve and the high-pressure shell is selected in different ways according to the different working pressures of the compressor. When the exhaust pressure is low (such as R134a, R410A refrigerant compressors), an O-ring seal can be used for sealing; when the exhaust pressure is high (such as CO2 compressors), a sealing gasket can be used for sealing, and an annular groove for positioning the O-ring or sealing gasket can be provided in the pressure relief part 2.

[0054] In some other embodiments, the throttling part 1 and the pressure relief part 2 can be separate, that is, the two can be detachably connected and assembled into one piece when in use. Figure 1 Example, Figure 3This is a schematic diagram of the structure of the throttle portion of this embodiment. A guide rod 11 is provided at the end of the throttle portion 1 connected to the pressure relief portion 2; a guide groove adapted to the guide rod 11 is provided at the end of the pressure relief portion 2 connected to the throttle portion 1; the throttle portion 1 and the pressure relief portion 2 are connected via an interference fit between the guide rod 11 and the guide groove. It should be noted that a guide rod provided at the end of the pressure relief portion 2 connected to the throttle portion 1, and a guide groove adapted to the guide rod 11 is also provided at the end of the throttle portion 1 connected to the pressure relief portion 2, is also a feasible solution.

[0055] The throttle portion 1 of the present invention can be made of either a resin or metal material. The advantage of the detachable throttle portion 1 and pressure relief portion 2 is that they can be manufactured separately, reducing the difficulty of manufacturing an integrated throttle pressure relief valve, especially a pressure relief portion with a hollow cavity. Furthermore, the detachable throttle portion 1 and pressure relief portion 2 facilitates the installation of the pressure relief valve in the high-pressure airflow passage of the compressor's high-pressure casing.

[0056] In order to facilitate the threaded connection between the throttle relief valve and the high-pressure air flow channel of the compressor, the integrated throttle relief valve may further include a head 5, which is connected to the end of the pressure relief portion 2 away from the throttle portion 1. The cross-section of the head 5 may be hexagonal to match existing tools such as wrenches. At this time, the first sealing member 4 may be sleeved between the pressure relief portion 2 and the head 5, as shown in FIG. Figure 1 shown.

[0057] The present invention also provides a compressor 9 including the above-mentioned integrated throttle pressure relief valve. Figure 4 This is a schematic diagram of a partial structure of a compressor according to an embodiment of the present invention. The high-pressure housing of the compressor is provided with a high-pressure airflow channel 91 and a low-pressure airflow channel 92. The throttle portion 1 is gap-connected to the high-pressure airflow channel 91, and the low-pressure airflow channel 92 is connected to the gap between the throttle portion and the high-pressure airflow channel 91. The structure and basic parameters of each component of the integrated throttle pressure relief valve are further explained below using the operating principle of the valve.

[0058] The pressure of the high-pressure air flow channel is greater than the critical pressure, that is, when the exhaust pressure is higher than the rated pressure relief pressure of the pressure relief valve, the integrated throttling pressure relief valve begins to relieve pressure. Figure 5This is a working state diagram of the pressure relief valve of an embodiment of the present invention during pressure relief, wherein the solid arrows represent the discharge channel of the high-pressure gas when the throttling pressure relief valve is releasing pressure, and the dotted arrows represent the throttling and oil return channels of the high-pressure lubricating oil. When the throttling pressure relief valve begins to release pressure, the high-pressure gas pushes open the piston 200 in the hollow cavity 21 through the first air flow channel 100, and the piston 200 separates from the end surface of the hollow cavity 21 or from the first annular protrusion structure 500, and the high-pressure gas enters the upper space of the hollow cavity 21. At the same time, the high-pressure gas in the hollow cavity 21 flows from both sides of the piston to the lower space of the hollow cavity 21 until it reaches the second air flow channel 400. The second air flow channel 400 is connected to the atmosphere, that is, the high-pressure gas is discharged from the compressor through the second air flow channel 400. As the high-pressure gas is discharged, the pressure in the high-pressure airflow channel decreases. When the exhaust pressure is slightly lower than the rated pressure relief pressure of the throttle pressure relief valve, the telescopic structure presses the piston back against the end face of the hollow cavity 21 or the first annular protrusion structure, thereby cutting off the first airflow channel 100 and the hollow cavity 21 to block the pressure relief, and the pressure relief ends.

[0059] During the operation of the compressor, the high-pressure lubricating oil is throttled through the throttle part of the throttle relief valve. Figure 6 This is a working state diagram of the throttling part of an embodiment of the present invention. Specifically, according to fluid mechanics, the size of the throttling effect is related to the throttling area and the throttling length. The smaller the throttling area and the longer the throttling length, the better the throttling effect. When the throttling part 1 is provided with a first thread 32 on the outer circumference, the first thread 32 can form a capillary flow structure with the inner wall of the high-pressure air flow channel 91. Through the small and long channel here, this gap channel is connected with the low-pressure fluid channel provided in the high-pressure shell, so that the lubricating oil returns to the low-pressure chamber or the medium-pressure chamber of the compressor, completing the throttling process. Of course, the gap connection between the throttling part 1 and the high-pressure air flow channel 91 is not limited to the above-mentioned threaded connection method. In actual use, it is necessary to ensure the required throttling effect by designing the gap between the throttling part and the high-pressure air flow channel to ensure that the difference between the actual flow area and the calculated flow area is as small as possible.

[0060] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is limited by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present application. Any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. An integrated throttle pressure relief valve, characterized in that: Used to connect with the high-pressure air flow channel of the high-pressure housing of the compressor, comprising a throttle portion, a pressure relief portion, a connector for connecting the throttle pressure relief valve and the high-pressure air flow channel, and a first sealing member for sealing the throttle pressure relief valve and the high-pressure air flow channel, which are connected in sequence; The throttling portion is provided with a first air flow channel; The pressure relief portion is provided with a hollow cavity containing a piston and a telescopic structure for driving the piston to reciprocate, and at least one second air flow channel connecting the hollow cavity and the space outside the throttle pressure relief valve; When the piston is in the first state, the first air flow channel is not connected to the hollow cavity; When the piston is in the second state, the first air flow channel, the hollow cavity and the second air flow channel are connected; The throttling portion is used to be connected to the high-pressure air flow channel gap, and the low-pressure air flow channel of the compressor is connected to the gap between the throttling portion and the high-pressure air flow channel.

2. The integrated throttle pressure relief valve according to claim 1, characterized in that: The throttling portion and the pressure relief portion are an integrated piece.

3. The integrated throttle pressure relief valve according to claim 1, characterized in that: The throttling part and the pressure relief part are detachably connected.

4. The integrated throttle pressure relief valve according to claim 3, characterized in that: One end of the throttling portion connected to the pressure relief portion is provided with a guide rod, and one end of the pressure relief portion connected to the throttling portion is provided with a guide groove adapted to the guide rod, and the throttling portion and the pressure relief portion are connected through an interference fit between the guide rod and the guide groove; or A guide rod is provided at one end of the pressure relief part connected to the throttling part, and a guide groove adapted to the guide rod is provided at one end of the throttling part connected to the pressure relief part. The throttling part and the pressure relief part are connected through the interference fit of the guide rod and the guide groove.

5. The integrated throttle and pressure relief valve according to claim 1, characterized in that: The connecting member is a first thread, and the first thread is provided on the outer peripheral surface of the throttling portion; and / or The connecting piece is a second thread, and the second thread is arranged on the outer peripheral surface of the pressure relief part.

6. The integrated throttle pressure relief valve according to claim 1, characterized in that: The device further comprises a head portion connected to an end of the pressure relief portion facing away from the throttling portion.

7. The integrated throttle and pressure relief valve according to claim 6, characterized in that: The first sealing member is an annular elastic member.

8. The integrated throttle and pressure relief valve according to claim 7, characterized in that: The first sealing member is sleeved on the pressure relief portion; or The first sealing member is sleeved between the pressure relief portion and the head portion.

9. The integrated throttle and pressure relief valve according to claim 1, characterized in that: The throttling part is made of resin material or metal material.

10. The integrated throttle and pressure relief valve according to claim 1, characterized in that: Also included is a second seal; The second sealing member is a first annular protrusion structure provided on the hollow cavity, and when the piston is in the first state, the first annular protrusion structure abuts against an end of the piston facing the first air flow channel; or The second sealing member is a second annular protrusion structure provided at one end of the piston facing the first air flow channel. When the piston is in the first state, the second annular protrusion structure contacts the inner wall of the hollow cavity close to the first air flow channel.

11. A compressor, characterized in that: comprising the integrated throttle and pressure relief valve according to any one of claims 1 to 10; The high-pressure housing of the compressor is provided with a high-pressure air flow channel and a low-pressure air flow channel.

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