Explosion-proof housing, housing assembly method and compressor

Abstract

The application provides an explosion-proof shell, a shell assembling method and a compressor, and the explosion-proof shell comprises a front cover and a rear shell with an inner cavity in the interior, the end face of the rear shell is provided with a circumferentially-extended ring groove, and the rear shell is provided with a venting joint directly communicating with the inner cavity, and the venting joint can inject refrigerant into the inner cavity; wherein the front cover can be covered on the end face of the rear shell to close the ring groove and form an isolation cavity. According to the technical scheme of the application, the ring groove is constructed on the end face of the rear shell, and a double-sealing structure is formed in the structure, so that the sealing performance is improved, and the isolation cavity formed by the closed ring groove can play a buffering role when the internal refrigerant leaks, refrigerant can be prevented from directly leaking to the outside, the scale of instantaneous refrigerant leakage can be reduced, and the application is suitable for refrigerants with high sealing requirements.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to an explosion-proof housing, a housing assembly method, and a compressor. Background Technology

[0002] Currently, compressors are widely used in various fields, such as refrigerators, air conditioners and other refrigeration appliances. Moreover, the application scenarios of these appliances are not limited to indoor home environments, but are also widely used in vehicles such as automobiles. As a result, compressors are also widely used in vehicles such as automobiles.

[0003] However, with increasingly stringent environmental protection requirements, there are strict restrictions on the refrigerants used inside compressors, which must meet corresponding environmental standards. Therefore, the industry has begun to adopt some natural and environmentally friendly refrigerants. However, these refrigerants often place additional challenges on the structural performance of compressors. For example, the widely used R290 natural and environmentally friendly refrigerant has the advantages of low GWP (Global Warming Potential) and low boiling point, meeting environmental requirements. However, this type of refrigerant is flammable and prone to explosion in air. Therefore, using this type of refrigerant places significant challenges and requirements on the sealing and safety of the compressor's structural design.

[0004] Most current compressors only use sealing rings to seal the joints, which is obviously unreliable in long-term use and prone to refrigerant leakage. For compressors using flammable refrigerants such as R290, refrigerant leakage could potentially lead to combustion, explosion, and other safety accidents.

[0005] Therefore, it is necessary to optimize the design of the compressor casing to improve its sealing performance and leak-proof capabilities, so as to avoid safety accidents caused by refrigerant leakage. Summary of the Invention

[0006] To address the problem that the sealing structure of existing compressor housings is unreliable and makes them unsuitable for some refrigerants with high sealing requirements, this invention proposes an explosion-proof housing, a housing assembly method, and a compressor.

[0007] In a first aspect, the present invention provides an explosion-proof housing, comprising:

[0008] Front cover; and

[0009] The rear shell has an inner cavity inside. The end face of the rear shell has an annular groove extending in the circumferential direction. The rear shell is provided with a vent connector that communicates directly with the inner cavity. The vent connector can inject refrigerant into the inner cavity.

[0010] The front cover can be fitted onto the end face of the rear shell to close the annular groove and form an isolation cavity.

[0011] In one embodiment, the isolation chamber is configured as a vacuum or the isolation chamber is filled with a refrigerant inhibitor.

[0012] In one embodiment, the inner cavity and the annular groove are connected by an openable and closable second channel, and the vent connector can evacuate the isolation cavity and / or inject refrigerant inhibitors into the isolation cavity through the inner cavity and the second channel.

[0013] In one embodiment, the rear shell has an outer ring portion and an inner ring portion that form the annular groove, and the inner side of the inner ring portion is the inner cavity;

[0014] The second channel is disposed in the inner ring portion, and the outer ring portion has a first channel that corresponds to and is coaxial with the second channel, and a plug is fitted in the first channel;

[0015] The plug can move axially along the first channel and the second channel to control whether the sealing end of the plug enters or does not enter the second channel, thereby controlling whether the isolation cavity is connected to the inner cavity.

[0016] In one embodiment, the inner diameter of the first channel is larger than the inner diameter of the second channel, the plug is a variable diameter structure, the plug includes a first plug head and a second plug head whose radial dimensions are respectively matched with the first channel and the second channel, and the sealing end is the end of the second plug head.

[0017] In one embodiment, at least one of the two channels is provided with a vent sealing ring on the inner wall of the first channel, and the plug is provided with a vent sealing ring on the outer surface at least at the end of the plug, the vent sealing ring being used to seal the gap between the channel and the plug.

[0018] In one embodiment, the rear housing has an outer ring portion and an inner ring portion that form the annular groove, and an end face sealing ring is provided on the end face of both the outer ring portion and the inner ring portion.

[0019] In one embodiment, the rear cover has a plurality of circumferentially distributed fastening grooves at the bottom of the annular groove, and the front cover has a plurality of circumferentially distributed mounting holes on its edge. The mounting holes and the fastening grooves can cooperate with fasteners to connect the front cover and the rear cover.

[0020] In one embodiment, the diameters of both the mounting hole and the fastening groove are smaller than the width of the annular groove.

[0021] In one embodiment, the front cover is provided with an exhaust connector communicating with its interior, and the exhaust connector communicates with the inner cavity of the rear cover after the front cover and the rear cover are assembled.

[0022] In one embodiment, the pressure P2 of the refrigerant inhibitor injected into the isolation cavity satisfies: P3≤P2≤P1; where P1 is the minimum pressure in the inner cavity of the housing when the compressor is running, and P3 is the external ambient pressure.

[0023] Secondly, the present invention provides a shell assembly method, comprising:

[0024] The front cover of the explosion-proof housing is assembled to the rear housing, so that the front cover is fastened to the end face of the rear housing and closes the annular groove on the end face of the rear housing to form an isolation cavity;

[0025] By using the vent connector on the rear shell that communicates with the inner cavity of the rear shell, the inner cavity and the isolation cavity are simultaneously evacuated to a vacuum state through the second channel that connects the inner cavity and the isolation cavity;

[0026] Close the second channel and inject refrigerant into the inner cavity of the rear shell using the vent connector.

[0027] In one embodiment, after simultaneously evacuating the inner cavity and the isolation cavity to a vacuum state, the method further includes:

[0028] Refrigerant inhibitors are simultaneously injected into the isolation chamber and the inner chamber using the vent connector;

[0029] Close the second channel, use the vent connector to extract the refrigerant inhibitor from the inner cavity, and then use the vent connector to inject refrigerant into the inner cavity.

[0030] In one implementation, it further includes:

[0031] Move the plug in the first channel on the rear shell that corresponds to the second channel;

[0032] The plug is positioned so that its sealing end does not enter the second channel, thereby opening the second channel and allowing the isolation cavity and the inner cavity to communicate through the second channel;

[0033] The plug is positioned so that its sealing end enters the second channel, and the sealing end remains in sealed contact with the inner wall of the second channel to close the second channel.

[0034] Thirdly, the present invention provides a compressor that includes the aforementioned explosion-proof housing, thereby possessing all of its technical effects.

[0035] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0036] The explosion-proof housing, housing assembly method, and compressor provided by this invention have at least the following advantages compared with the prior art:

[0037] The present invention discloses an explosion-proof housing, a housing assembly method, and a compressor. By constructing an annular groove on the end face of the rear housing, a double sealing structure is formed in the structure, thereby improving the sealing performance. Furthermore, the isolation cavity formed by the annular groove after being closed by the front cover can also play a buffering role when the internal refrigerant leaks, preventing the refrigerant from leaking directly to the outside and reducing the scale of instantaneous refrigerant leakage. Therefore, it is suitable for refrigerants with high requirements for sealing performance. Attached Figure Description

[0038] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0039] Figure 1 An exploded view of the casing structure of the present invention is shown;

[0040] Figure 2 The image shows a frontal projection view of the housing of the present invention;

[0041] Figure 3 The housing of the present invention is shown in Figure 2 A sectional view from a specific perspective;

[0042] Figure 4 This shows a cross-sectional view of the housing of the present invention from another perspective;

[0043] Figure 5 A schematic diagram showing the relevant dimensions of the vent connector of the housing and the channel on the rear shell of the present invention is provided.

[0044] Figure 6 A schematic diagram showing the first stage of the housing assembly process of the present invention is shown;

[0045] Figure 7 A schematic diagram of the second stage of the housing assembly process of the present invention is shown.

[0046] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0047] Figure label:

[0048] 1-Front cover, 11-Exhaust connector, 2-Rear shell, 21-Annular groove, 211-Fasting groove, 22-Outer ring, 23-Inner ring, 24-Inner cavity, 25-Ventil connector, 3-Isolation cavity, 4-First channel, 5-Second channel, 6-Plug, 61-First plug head, 62-Second plug head, 7-Ventil sealing ring, 8-End face sealing ring. Detailed Implementation

[0049] The invention will now be further described with reference to the accompanying drawings.

[0050] Example 1

[0051] An embodiment of the present invention provides an explosion-proof housing, comprising:

[0052] Front cover 1; and

[0053] The rear shell 2 has an inner cavity 24 inside. The end face of the rear shell 2 has an annular groove 21 extending in the circumferential direction. The rear shell 2 has an outer ring portion 22 and an inner ring portion 23 that surround the annular groove 21. An end face sealing ring 8 is provided on the end face of the outer ring portion 22 and the inner ring portion 23. The rear shell 2 is provided with a vent connector 25 that is directly connected to the inner cavity 24. The vent connector 25 can inject refrigerant into the inner cavity 24.

[0054] The front cover 1 can be fitted onto the end face of the rear shell 2 to close the annular groove 21 and form an isolation cavity 3.

[0055] Specifically, the present invention first designs the structure of the assembly part of the compressor housing, that is, firstly, designs an annular groove 21 structure on the end face of the rear housing 2, as shown in the attached figure. Figure 2 and Figure 4 As shown in the attached diagram, after the front cover 1 is fitted onto the end face of the rear shell 2, the end face of the front cover 1 closes the annular groove 21 and forms a relatively sealed isolation cavity 3, which serves as part of the sealing structure. Of course, as in traditional methods, a sealing ring, i.e., an end face sealing ring 8, is also provided on the end face. Thus, the isolation cavity 3 effectively forms two annular sections on the end face, as shown in the attached diagram. Figure 4 As shown, a double-layer sealing structure can be constructed using the sealing ring, and the end face sealing ring 8 of the inner ring 23 will not be in direct contact with the outside, which can improve its service life and the reliability of the structure.

[0056] Furthermore, in this embodiment, a vent connector 25 is provided on the rear shell 2 that is directly connected to the inner cavity 24, which can directly inject refrigerant into the next inner cavity 24, or further realize other functions.

[0057] Furthermore, in the housing structure of the present invention, the inner ring 23 and the outer ring do not have a height difference of L1. The end face sealing ring 8 used in the outer ring 22 is an elastic sealing gasket with a static height of H0 and a height of H1 after compression. The maximum deformation is X (ensuring that the inner ring 23 first fits against the end face of the front cover 1), and satisfies H0 > H1 ≥ H0 - X, L1 = H1. The end face sealing ring 8 of the inner ring 23 is an embedded sealing ring. The sealing ring is higher than the end face in a static state, and is flush with the end face of the inner ring 23 after being squeezed by the front cover 1.

[0058] Furthermore, the isolation chamber 3 can be further designed to enhance its sealing performance and resistance to refrigerant leakage, depending on the specific needs. Preferably, the isolation chamber 3 is configured as a vacuum or filled with refrigerant inhibitors.

[0059] Specifically, for refrigerants with flammable properties, a refrigerant inhibitor (gas) can be injected into the isolation chamber 3. Taking R290 (propane) refrigerant as an example, the refrigerant inhibitor can be CO2 or R1311 (trifluoroiodomethane). The refrigerant inhibitor mixes with the refrigerant before it leaks to the outside, effectively reducing the critical peak pressure and explosion index of flammable and explosive refrigerants. Due to the existence of the isolation chamber 3, even if the refrigerant leaks, it will not leak directly to the outside immediately, but will mix with the refrigerant inhibitor in the isolation chamber 3, reducing its potential explosive properties and effectively reducing safety risks.

[0060] Alternatively, the isolation chamber 3 can be constructed as a vacuum structure. The vacuum-state isolation chamber 3 primarily prevents direct refrigerant leakage by storing any refrigerant that is about to leak. The vacuum-state isolation chamber 3 has a certain storage space. When refrigerant leaks from the inner chamber 24 outwards, it first enters the isolation chamber 3, thus storing the refrigerant and preventing direct leakage to the outside. Furthermore, as long as the end face sealing ring 8 of the outer ring 22 is intact, the refrigerant will only reach the isolation chamber 3 and will not continue to leak. Even if the refrigerant continues to leak (due to the failure of the end face sealing ring 8 of the outer ring 22), the isolation chamber 3 can still act as a buffer, reducing the instantaneous flow rate of the refrigerant leak. This reduces the concentration of refrigerant in the air near the casing at the same time, preventing the refrigerant concentration from reaching the concentration required for combustion and explosion. For example, R290 refrigerant requires a concentration of 2.5% to 8.9% in the air to cause combustion and explosion. Therefore, reducing the instantaneous flow rate of the refrigerant leak can reduce its instantaneous concentration in the air, and after the refrigerant diffuses in the air, the concentration further decreases, effectively preventing combustion and explosion.

[0061] Meanwhile, the buffering effect of the isolation chamber 3 during the refrigerant leakage process is not only reflected in reducing the instantaneous concentration, but also in using its internal space to buffer the refrigerant, reducing the pressure when the refrigerant leaks to the outside, thus reducing the impact of the refrigerant on the shell, thereby reducing the intensity of the shell vibration caused by the refrigerant leakage. The reduction of vibration intensity can prevent excessive vibration from further causing deformation and damage to the sealing structure, which would lead to a further expansion of the leakage scale.

[0062] It should be noted that the technical advantage of the isolation chamber 3 mentioned above, namely the buffering effect when refrigerant leaks, is not only present in the isolation chamber 3 under vacuum, but is an advantage of the structure of the isolation chamber 3 itself. The existence of the isolation chamber 3 can bring about this technical effect, so the isolation chamber 3 under normal pressure has the same technical effect.

[0063] Preferably, the pressure P2 of the refrigerant inhibitor injected into the isolation chamber 3 satisfies: P3≤P2≤P1; where P1 is the minimum pressure in the inner cavity 24 of the housing when the compressor is running, and P3 is the external environmental pressure.

[0064] Specifically, during compressor operation, the pressure inside the casing is higher than the external ambient pressure, resulting in a significant pressure difference. This pressure difference creates a driving force for the refrigerant inside the casing to leak to the outside. Based on the isolation chamber 3 structure proposed in this invention, a refrigerant inhibitor with a certain pressure is injected into the isolation chamber 3. This transforms the original pressure difference between the inner cavity 24 and the external environment into a pressure difference between the inner cavity 24 and the isolation chamber 3. By using the controllable pressure of the isolation chamber 3 to replace the uncontrollable external ambient pressure, and by establishing an intermediate value between the pressure of the inner cavity 24 and the external ambient pressure based on the structural design, the pressure difference directly acting on the refrigerant inside the inner cavity 24 at the first moment is effectively reduced. This reduces the driving force for refrigerant leakage to the outside, thus reducing the force acting on the sealing structure and ultimately reducing the probability of refrigerant leakage.

[0065] Furthermore, the inner cavity 24 and the annular groove 21 are connected by an openable and closable second channel 5, and the vent connector 25 can evacuate the isolation cavity 3 and / or inject refrigerant inhibitors into the isolation cavity 3 through the inner cavity 24 and the second channel 5.

[0066] Specifically, as shown in the attached diagram. Figure 4 As shown, a second channel 5 exists between the inner cavity 24 and the annular groove 21, thus the isolation chamber 3 formed by the annular groove 21 can be operated via the vent connector 25 communicating with the inner cavity 24. For example, by opening the second channel 5, the vent connector 25 can be used to evacuate the isolation chamber 3 by evacuating the inner cavity 24; similarly, refrigerant inhibitors can also be injected into the isolation chamber 3 through the vent connector 25 via the inner cavity 24.

[0067] Furthermore, the rear shell 2 has an outer ring portion 22 and an inner ring portion 23 forming an annular groove 21, and the inner side of the inner ring portion 23 is an inner cavity 24;

[0068] The second channel 5 is located in the inner ring 23, and the outer ring 22 has a first channel 4 that corresponds to and is coaxial with the second channel 5. A plug 6 is fitted inside the first channel 4.

[0069] The plug 6 can move axially along the first channel 4 and the second channel 5 to control whether the sealing end of the plug 6 enters or does not enter the second channel 5, so as to control whether the isolation cavity 3 and the inner cavity 24 are connected.

[0070] Specifically, as shown in the attached diagram. Figure 4 As shown, the isolation cavity 3 and the inner cavity 24 are structurally connected, that is, connected through the second channel 5, and a first channel 4 corresponding to the second channel 5 is designed. This allows the plug 6 in the first channel 4 to control the opening and closing of the second channel 5, thus adapting to the needs of different assembly stages. Specifically:

[0071] In the first stage of assembly, after the front cover 1 and the rear shell 2 are closed, it is necessary to first evacuate the isolation cavity 3 and the inner cavity 24, as shown in the attached figure. Figure 6 As shown in the diagram, firstly, control the position of the plug 6 so that its sealing end does not enter the second channel 5, i.e., the second channel 5 is open. At this time, the vent connector 25 can be used to evacuate the isolation chamber 3 and the inner chamber 24. After evacuation, subsequent operations are required according to the specific structure of the isolation chamber 3. If it is necessary to inject refrigerant inhibitor into the isolation chamber 3, then in the first stage, after evacuation, as shown in the attached diagram... Figure 6 In the state shown, refrigerant inhibitors are injected simultaneously into the isolation chamber 3 and the inner chamber 24 through the vent connector 25.

[0072] In the second stage of assembly, adjust the position of the vent connector 25 so that the vent end is connected to the second channel 5, as shown in the attached diagram. Figure 7 As shown, the second channel 5 is then closed, and the vent connector 25 is connected to the inner cavity 24 separately. At this time, the refrigerant inhibitor in the inner cavity 24 is extracted through the vent connector 25, and then refrigerant is injected into the inner cavity 24. The vent connector 25 serves as the air inlet connector during normal compressor operation.

[0073] Furthermore, for cases where it is not necessary to inject refrigerant inhibitors into isolation chamber 3, the second stage can be directly initiated after the vacuum is drawn in the first stage, as shown in the attached diagram. Figure 7 As shown, refrigerant is injected into the inner cavity 24 through the vent connector 25, and the isolation cavity 3 is kept in a vacuum state.

[0074] Furthermore, the inner diameter of the first channel 4 is larger than the inner diameter of the second channel 5, and the plug 6 is a variable diameter structure. The plug 6 includes a first plug head 61 and a second plug head 62 whose radial dimensions are respectively matched with the first channel 4 and the second channel 5, and the sealing end is the end of the second plug head 62.

[0075] Specifically, as shown in the attached diagram. Figure 6 As shown, the radial dimension of the second plug head 62 is relatively reduced. This reduces the space occupied by the second plug head 62 in the isolation cavity 3 and avoids obstructing the circumferential flow path of the isolation cavity 3. Furthermore, the variable diameter design of the first plug head 61 and the second plug head 62 ensures that the sealing surfaces between the first plug head 61 and the first channel 4 and between the second plug head 62 and the second channel 5 are not on the same plane, but are staggered, which helps improve sealing performance.

[0076] Furthermore, at least one of the two channels is provided with a venting sealing ring 7 on the inner wall of the first channel 4, and at least one of the plugs 6 is provided with a venting sealing ring 7 on the outer surface at the end of the plug. The venting sealing ring 7 is used to seal the gap between the channel and the plug 6.

[0077] Specifically, as shown in the attached diagram. Figure 4 As shown, at least two vent sealing rings 7 are used to form a sealing structure with the first channel 4 and the second channel 5, respectively. Furthermore, as shown in the attached figure… Figure 5 As shown, in the relative dimensions of the channel and the vent connector 25, the effective sealing distance from the outer end face of the first channel 4 to the vent sealing ring 7 therein is S1, the effective circular length of the second channel 5 is S2, the distance from the outer end face of the first channel 4 to the outer end face of the second channel 5 is S3, and the effective sealing area length of the vent sealing ring 7 inside the first channel 4 is S4. The length of the first plug head 61 is Q1, the length of the second plug head 62 is Q2, the distance from the end face of the second plug head 62 to the effective sealing area of ​​the vent sealing ring 7 on it is Q3, and the effective sealing area length of the vent sealing ring 7 on the second plug head 62 is Q4; where Q1 + Q2 - Q3 ≥ S3.

[0078] During the assembly process, the position of the vent connector 25 meets the following conditions: in the first stage of assembly, Q2 does not contact S2, and S1 is within the range of Q1; in the second stage of assembly, S1 is within the range of Q1, and Q4 is within the range of S2.

[0079] Furthermore, the rear cover 2 has multiple circumferentially distributed fastening grooves 211 at the bottom of the annular groove 21, and the front cover 1 has multiple circumferentially distributed assembly holes on its edge. The assembly holes and fastening grooves 211 can cooperate with fasteners to connect the front cover 1 and the rear cover 2.

[0080] Specifically, as shown in the attached diagram. Figure 1 and Figure 4As shown, the fastener's point of force directly corresponds to the annular groove 21, which can improve the sealing performance of the annular groove 21. At the same time, it applies compressive force to the end face sealing rings 8 of the outer ring 22 and the inner ring 23, making the inner and outer sealing rings bear force evenly and improving the reliability of the sealing structure.

[0081] Preferably, the diameters of both the mounting hole and the fastening groove 211 are smaller than the width of the annular groove 21. This avoids obstructing the circumferential flow path of the annular groove 21, thereby avoiding the need for vacuuming or injecting refrigerant inhibitors into the isolation cavity 3 formed by the annular groove 21.

[0082] Furthermore, the front cover 1 is provided with an exhaust connector 11 that communicates with its interior. After the front cover 1 and the rear cover 2 are assembled, the exhaust connector 11 communicates with the inner cavity 24 of the rear cover 2. The exhaust connector 11 is used for exhausting the compressor during normal operation.

[0083] Example 2

[0084] An embodiment of the present invention provides a housing assembly method, the assembly method comprising:

[0085] Step S100: Assemble the front cover of the explosion-proof housing onto the rear housing, so that the front cover is fastened to the end face of the rear housing and closes the annular groove on the end face of the rear housing to form an isolation cavity;

[0086] Step S200: Move the plug in the first channel corresponding to the second channel on the rear shell so that the plug is in a state where its sealing end has not entered the second channel, so as to open the second channel and make the isolation chamber and the inner cavity connected through the second channel. Using the vent connector on the rear shell that is connected to the inner cavity of the rear shell, the inner cavity and the isolation chamber are simultaneously evacuated to a vacuum state through the second channel that connects the inner cavity and the isolation chamber.

[0087] Step S210: Inject refrigerant inhibitors into the isolation chamber and the inner chamber simultaneously using the vent connector;

[0088] Step S300: Move the plug in the first channel corresponding to the second channel on the rear shell so that the plug is in the state where its sealing end enters the second channel, and keep the sealing end in sealed contact with the inner wall of the second channel to close the second channel. Use the vent connector to extract the refrigerant inhibitor in the inner cavity, and then use the vent connector to inject refrigerant into the inner cavity.

[0089] Specifically, as shown in the attached diagram. Figure 4 As shown, the isolation chamber and the inner chamber are structurally connected, i.e., connected through a second channel, and a first channel corresponding to the second channel is designed. This allows the plug in the first channel to control the opening and closing of the second channel, thus adapting to the needs of different assembly stages. Specifically:

[0090] In the first stage of assembly, after the front cover and rear shell are closed, it is necessary to first evacuate the isolation cavity and inner cavity, as shown in the attached diagram. Figure 6 As shown in the diagram, first, control the position of the plug to prevent its sealing end from entering the second channel, thus opening the second channel. At this point, a vacuum can be created between the isolation chamber and the inner cavity using the vent connector. After vacuuming, subsequent operations are required depending on the specific structure of the isolation chamber. If it is necessary to inject refrigerant inhibitor into the isolation chamber, then in the first stage, after vacuuming, as shown in the attached diagram... Figure 6 In the state shown, refrigerant inhibitors are injected simultaneously into the isolation chamber and the inner chamber directly through the vent connector.

[0091] In the second stage of assembly, adjust the position of the vent connector so that the vent end is connected to the second channel, as shown in the attached diagram. Figure 7 As shown, the second channel is then closed, and the vent connector is connected to the inner cavity separately. At this time, the refrigerant inhibitor in the inner cavity is extracted through the vent connector, and then refrigerant is injected into the inner cavity. The vent connector serves as the air intake connector during normal compressor operation.

[0092] Furthermore, for cases where it is not necessary to inject refrigerant inhibitors into the isolation chamber, the second stage can be directly initiated after the vacuum is drawn in the first stage, as shown in the attached diagram. Figure 7 As shown, refrigerant is injected into the inner cavity through the vent connector, and the isolation cavity is kept in a vacuum state.

[0093] Example 3

[0094] An embodiment of the present invention provides a compressor that includes the explosion-proof housing described above, thereby possessing all the technical effects described therein.

[0095] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0096] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An explosion-proof housing, characterized in that, include: Front cover; as well as The rear shell has an inner cavity inside. The end face of the rear shell has an annular groove extending in the circumferential direction. The rear shell is provided with a vent connector that communicates directly with the inner cavity. The vent connector can inject refrigerant into the inner cavity. The front cover can be fitted onto the end face of the rear shell to close the annular groove and form an isolation cavity; The isolation chamber is configured as a vacuum or the isolation chamber is filled with a refrigerant inhibitor; The inner cavity and the annular groove are connected by an openable and closable second channel. The vent connector can evacuate the isolation cavity and / or inject refrigerant inhibitors into the isolation cavity through the inner cavity and the second channel. The rear shell has an outer ring portion and an inner ring portion that form the annular groove, and the inner side of the inner ring portion is the inner cavity; The second channel is disposed in the inner ring portion, and the outer ring portion has a first channel that corresponds to and is coaxial with the second channel, and a plug is fitted in the first channel; The plug can move axially along the first channel and the second channel to control whether the sealing end of the plug enters or does not enter the second channel, thereby controlling whether the isolation cavity is connected to the inner cavity.

2. The housing according to claim 1, characterized in that, The inner diameter of the first channel is larger than the inner diameter of the second channel. The plug is a variable diameter structure. The plug includes a first plug head and a second plug head whose radial dimensions are respectively matched with the first channel and the second channel. The sealing end is the end of the second plug head.

3. The housing according to claim 1 or 2, characterized in that, At least one of the two channels has a venting sealing ring on the inner wall of the first channel, and the plug has a venting sealing ring on the outer surface at least at the end of the plug. The venting sealing ring is used to seal the gap between the channel and the plug.

4. The housing according to claim 1, characterized in that, The rear shell has an outer ring portion and an inner ring portion that form the annular groove, and an end face sealing ring is provided on the end face of both the outer ring portion and the inner ring portion.

5. The housing according to claim 1 or 4, characterized in that, The rear cover has multiple circumferentially distributed fastening grooves at the bottom of the annular groove, and the front cover has multiple circumferentially distributed assembly holes on its edge. The assembly holes and the fastening grooves can cooperate with fasteners to connect the front cover and the rear cover.

6. The housing according to claim 5, characterized in that, The diameters of both the assembly hole and the fastening groove are smaller than the width of the annular groove.

7. The housing according to claim 1, characterized in that, The front cover is provided with an exhaust connector that communicates with its interior. After the front cover and the rear cover are assembled, the exhaust connector communicates with the inner cavity of the rear cover.

8. The housing according to claim 1, characterized in that, The pressure P2 of the refrigerant inhibitor injected into the isolation cavity satisfies: P3≤P2≤P1; where P1 is the minimum pressure in the inner cavity of the housing when the compressor is running, and P3 is the external ambient pressure.

9. A method for assembling an explosion-proof enclosure according to any one of claims 1-8, characterized in that, include: The front cover of the explosion-proof housing is assembled to the rear housing, so that the front cover is fastened to the end face of the rear housing and closes the annular groove on the end face of the rear housing to form an isolation cavity; By using the vent connector on the rear shell that communicates with the inner cavity of the rear shell, the inner cavity and the isolation cavity are simultaneously evacuated to a vacuum state through the second channel that connects the inner cavity and the isolation cavity; Close the second channel and inject refrigerant into the inner cavity of the rear shell using the vent connector.

10. The housing assembly method according to claim 9, characterized in that, After simultaneously evacuating the inner cavity and the isolation cavity to a vacuum state, the process further includes: Refrigerant inhibitors are simultaneously injected into the isolation chamber and the inner chamber using the vent connector; Close the second channel, use the vent connector to extract the refrigerant inhibitor from the inner cavity, and then use the vent connector to inject refrigerant into the inner cavity.

11. The housing assembly method according to claim 9 or 10, characterized in that, Also includes: Move the plug in the first channel on the rear shell that corresponds to the second channel; The plug is positioned so that its sealing end does not enter the second channel, thereby opening the second channel and allowing the isolation cavity and the inner cavity to communicate through the second channel; The plug is positioned so that its sealing end enters the second channel, and the sealing end remains in sealed contact with the inner wall of the second channel to close the second channel.

12. A compressor, characterized in that, Includes the explosion-proof housing as described in any one of claims 1 to 8.

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