One-way valve, heating and ventilation equipment outdoor unit and heating and ventilation equipment

Abstract

The utility model discloses a one-way valve, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The one-way valve comprises a valve pipe and a valve element. The valve pipe comprises a first pipe section, an expanding pipe section and a second pipe section which are sequentially connected and communicated. The valve element is located in the expanding pipe section and can move between an opening position and a closing position, a flow channel is formed in the outer wall face of the valve element, and when the valve element is located at the closing position, the end, facing the first pipe section, of the valve element blocks the first pipe section so as to cut off communication between the first pipe section and the expanding pipe section. The end, facing the second pipe section, of the valve element is in limiting fit with the second pipe section, and the flow channel communicates with the expanding pipe section and the second pipe section. The valve element can block the first pipe section to achieve circulation closing in one direction and can be matched with the second pipe section in a limiting mode, circulation opening in the other direction is achieved through the flow channel, an original valve seat and check ring structure is omitted, and structural complexity and production cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heating, ventilation and air conditioning (HVAC) equipment, and particularly relates to a check valve for an outdoor unit of HVAC equipment and HVAC equipment. Background Art

[0002] The information provided in this part is only background information related to the present disclosure, and it is not necessarily prior art.

[0003] The outdoor unit of HVAC equipment includes a compressor, a heat exchanger, and a four-way valve connecting the compressor and the heat exchanger. A check valve needs to be configured at the inlet where the four-way valve is connected to the compressor to achieve one-way flow between the two.

[0004] The existing check valve needs to be equipped with a valve seat and a retaining ring in the valve body to cooperate with the valve core to achieve one-way opening and closing of the valve body. The structure is relatively complex and the production cost is high. Summary of the Utility Model

[0005] The purpose of the utility model is to at least solve the problems of the complex structure and high production cost of the existing check valve. This purpose is achieved through the following technical solutions:

[0006] In a first aspect, the utility model provides a check valve, which includes a valve tube and a valve core. The valve tube includes a first tube section, an enlarged-diameter tube section, and a second tube section that are sequentially connected and communicated. The inner diameter of the enlarged-diameter tube section is larger than the inner diameters of the first tube section and the second tube section. The valve core is located in the enlarged-diameter tube section and can move between an open position and a closed position. A flow channel is provided on the outer wall surface of the valve core. In the state where the valve core is in the closed position, one end of the valve core facing the first tube section blocks the first tube section to cut off the communication between the first tube section and the enlarged-diameter tube section. In the state where the valve core is in the open position, the first tube section is communicated with the enlarged-diameter tube section, one end of the valve core facing the second tube section is in limit fit with the second tube section, and the flow channel communicates the enlarged-diameter tube section and the second tube section.

[0007] According to the check valve provided by the utility model, the valve tube is designed to include an enlarged-diameter tube section with an inner diameter larger than that of the first tube section and the second tube section. The valve core can block the first tube section to achieve the closing of the flow in one direction, and can be in limit fit with the second tube section to achieve the opening of the flow in the other direction through the flow channel. The original valve seat and retaining ring structures are cancelled, reducing the complexity of the structure and the production cost.

[0008] In addition, according to the check valve provided by the utility model, the following additional technical features may also be included:

[0009] In some embodiments of the present utility model, the valve core includes a body and at least one limiting member. The radial dimension of the body is greater than or equal to the inner diameter dimension of the first pipe section. One end of the body facing the first pipe section is used to block the first pipe section. The limiting member is arranged on the outer wall surface of the body, and at least part of the flow channel is enclosed with the outer wall surface of the body.

[0010] In some embodiments of the present utility model, the number of the limiting members is multiple. The multiple limiting members are arranged on the outer wall surface of the body at intervals in the circumferential direction. An adjacent two of the limiting members and the outer wall surface of the body enclose a flow channel. The limiting member is used for limiting and cooperating with the second pipe section.

[0011] In some embodiments of the present utility model, a first limiting portion is provided at one end of each limiting member facing away from the first pipe section. The first limiting portion extends out of one end of the body facing away from the first pipe section and is used for limiting and cooperating with the second pipe section.

[0012] In some embodiments of the present utility model, the end face of the body facing the second pipe section is connected to the first limiting portion.

[0013] In some embodiments of the present utility model, the body includes a first part and a second part which are connected. Compared with the second part, the first part is arranged closer to the second pipe section. The limiting member is connected to the first part. Intersecting with the first part, the second part is arranged closer to the first pipe section. Along one end of the second part close to the first part to the end away from the first part, the radial dimension of the second part gradually decreases.

[0014] In some embodiments of the present utility model, an inclined surface which is smoothly transitionally connected to the outer wall surface of the second part is provided at one end of the limiting member close to the second part.

[0015] In some embodiments of the present utility model, one end of the second pipe section is inserted into the enlarged-diameter pipe section and is connected to the first pipe section. In a state where the valve core is in the open position, one end of the valve core facing the second pipe section is in limiting cooperation with one end of the second pipe section inserted into the enlarged-diameter pipe section.

[0016] In some embodiments of the present utility model, a second limiting portion is provided on the outer wall surface of the second pipe section. The second limiting portion is used for limiting and cooperating with one end of the first pipe section facing away from the enlarged-diameter pipe section.

[0017] In some embodiments of the present utility model, the second limiting portion includes a protrusion.

[0018] In some embodiments of the present utility model, one end of the first pipe section facing away from the second pipe section is provided with a first flared structure, the inner diameter of the first flared structure is larger than the inner diameter of the remaining part of the first pipe section, and / or one end of the second pipe section facing away from the first pipe section is provided with a second flared structure, the inner diameter of the second flared structure is larger than the inner diameter of the remaining part of the second pipe section.

[0019] In some embodiments of the present utility model, the first pipe section, the diameter-expanded pipe section and the second pipe section are of an integrally formed structure.

[0020] In a second aspect, the present utility model provides an outdoor unit of a heating, ventilation and air conditioning (HVAC) device, including a housing, a heat exchanger, a compressor, a four-way valve and a check valve as described in any one of the above technical solutions; the compressor, the heat exchanger, the four-way valve and the check valve are located inside the housing, the four-way valve has a first communication port and a second communication port, the first communication port, the check valve and the compressor are connected in sequence, and the second communication port is connected to the heat exchanger.

[0021] In a third aspect, the present utility model provides a heating, ventilation and air conditioning (HVAC) device, including an indoor unit of a heating, ventilation and air conditioning (HVAC) device and an outdoor unit of a heating, ventilation and air conditioning (HVAC) device as described in any one of the above technical solutions, and the indoor unit of the heating, ventilation and air conditioning (HVAC) device and the outdoor unit of the heating, ventilation and air conditioning (HVAC) device are connected by pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered as a limitation of the present utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0023] Figure 1 Schematically shows a schematic structural diagram of the check valve provided by an embodiment of the present utility model from a first perspective;

[0024] Figure 2 Schematically shows a schematic structural diagram of the check valve provided by an embodiment of the present utility model from a second perspective;

[0025] Figure 3 is Figure 2 the A-A sectional view of;

[0026] Figure 4 is Figure 3 the schematic structural diagram of the check valve in the closed state in;

[0027] Figure 5 is Figure 3 the schematic structural diagram of the check valve in the open state in;

[0028] Figure 6 Schematically shown is a structural schematic diagram of a valve core of a check valve provided according to an embodiment of the present utility model.

[0029] The reference numerals are as follows:

[0030] 100, check valve;

[0031] 10, valve tube; 11, first tube section; 111, first flared structure; 12, enlarged diameter tube section; 121, diameter-changing structure; 13, second tube section; 131, second limiting portion; 132, second flared structure;

[0032] 20, valve core; 21, body; 211, first part; 212, second part; 22, limiting member; 221, first limiting portion; 222, inclined surface; 23, flow channel. Detailed implementation manners

[0033] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0034] It should be understood that the terms used herein are only for the purpose of describing specific exemplary embodiments and are not intended to be limiting. Unless otherwise clearly indicated in the context, the singular forms "a", "an" and "the" as used herein may also include the plural forms. The terms "include", "comprise", "contain" and "have" are inclusive and thus specify the presence of the stated features, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the execution order is explicitly stated. It should also be understood that additional or alternative steps can be used.

[0035] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms do not imply an order or sequence when used herein. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0036] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figures to another element or feature, such as "inside," "outside," "inner side," "outer side," "below," "beneath," "above," "over," etc. Such spatial relative relationship terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as "below" or "beneath" another element or feature will then be oriented "above" or "over" the other element or feature. Thus, the exemplary term "below" can include both the above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein are to be interpreted accordingly.

[0037] Combined with the attached Figures 1-3 As shown, the present embodiment provides a check valve 100, and the check valve 100 can be used in the outdoor unit of a heating, ventilation, and air conditioning (HVAC) device. For example, the check valve 100 can be installed at an inlet of a four-way valve of the outdoor unit of the HVAC device and is used to connect to a compressor.

[0038] The check valve 100 of the present embodiment includes a valve tube 10 and a valve core 20. The valve tube 10 is a tubular structure, and its material can be metal or plastic with high structural strength. Its cross-sectional shape can be circular or approximately circular. The valve tube 10 includes a first pipe section 11, an enlarged-diameter pipe section 12, and a second pipe section 13 that are sequentially connected and communicate with each other. Among them, the inner diameter of the enlarged-diameter pipe section 12 is greater than the inner diameters of the first pipe section 11 and the second pipe section 13. The "inner diameter" refers to the diameter of the inner wall surface of each pipe section or the radial dimension, and the radial dimension of the outer wall of the enlarged-diameter pipe section 12 can be greater than or equal to the inner diameters of the outer walls of the first pipe section 11 and the second pipe section 13.

[0039] The valve core 20 of this embodiment is installed in the enlarged-diameter pipe section 12. The radial dimension of the outer wall surface of the valve core 20 is less than or equal to the radial dimension of the inner wall surface of the enlarged-diameter pipe section 12. Specifically, the radial dimension of the outer wall surface of the valve core 20 can be slightly less than the radial dimension of the inner wall surface of the enlarged-diameter pipe section 12. For example, the difference between the two is within 0.1 mm - 10 mm, so that the valve core 20 can move along the length direction or the axial direction of the enlarged-diameter pipe section 12 driven by liquids such as refrigerant.

[0040] Combined with the attached Figures 3-5 As shown, the valve core 20 of this embodiment is located in the enlarged-diameter pipe section 12 and can move between an open position and a closed position. The open position means that the valve core 20 is at one end of the enlarged-diameter pipe section 12 that is away from the first pipe section 11 and close to the second pipe section 13. The closed position means that the valve core 20 is at one end of the enlarged-diameter pipe section that is close to the first pipe section 11 and away from the second pipe section 13. A flow channel 23 is provided on the outer wall surface of the valve core 20. The valve core 20 of this embodiment is configured such that when it is in the Figure 4 closed position, the end of the valve core 20 facing the first pipe section 11 seals the first pipe section 11 to cut off the connection between the first pipe section 11 and the enlarged-diameter pipe section 12. When the valve core 20 of this embodiment is in the Figure 5 open position, the first pipe section 11 and the enlarged-diameter pipe section 12 are connected. The end of the valve core 20 facing the second pipe section 13 is in limit fit with the second pipe section 13, and the flow channel 23 connects the enlarged-diameter pipe section 12 and the second pipe section 13.

[0041] Combined with the above structural description, in this embodiment, the valve pipe 10 is designed to include an enlarged-diameter pipe section 12 with an inner diameter larger than that of the first pipe section 11 and the second pipe section 13, so that a limit structure similar to a step is formed between the enlarged-diameter pipe section 12 and the first pipe section 11. Similarly, a limit structure similar to a step is formed between the enlarged-diameter pipe section 12 and the second pipe section 13. Both ends of the valve core 20 can be in limit fit with the first pipe section 11 and the second pipe section 13 respectively. Then, the valve core 20 is used to seal the first pipe section 11 to achieve the closing of the flow in one direction, and the flow channel 23 is used to achieve the opening of the flow in the other direction, eliminating the original valve seat and retaining ring structures, and reducing the structural complexity and production cost.

[0042] Combined with the attached Figure 6 As shown, in some examples, optionally, the valve core 20 of this embodiment includes a body 21 and a plurality of limit members 22. The body 21 of this embodiment can be a structure that is hollow inside and open to the second pipe section 13 to facilitate weight reduction for easy movement. The material of the body 21 can be metal or plastic. The material of the limit members 22 of this embodiment can be the same as that of the body 21, so that the body 21 and the limit members 22 can be integrally formed during processing, or integrally connected by welding, hot melting, etc.

[0043] The limiting member 22 of this embodiment can be a plate-shaped member or a block-shaped member. A plurality of limiting members 22 are arranged at intervals along the circumferential direction of the main body 21 on the outer wall surface of the main body 21. A flow channel 23 is formed between the outer wall surface of the main body 21 and two adjacent limiting members 22, so as to Figure 6 Taking the four limiting members 22 in Figure 6 as an example, the four limiting members 22 and the main body 21 form four flow channels 23.

[0044] The number of the limiting members 22 can also be one. When the number of the limiting members 22 is one, a flow channel can be formed between the two circumferential sides of the limiting member 22 and the outer wall surface of the main body 21.

[0045] Of course, the structural form of the valve core 20 in this embodiment is not limited to this. For example, the valve core 20 can also be a hollow cylinder with a radial dimension larger than that of the first pipe section 11 and the second pipe section 13. Grooves with gradually increasing depths in the direction close to the second pipe section 13 are formed on the outer wall surface of the cylinder to form the flow channel 23 (this implementation method is not shown in the figure). The grooves do not extend to the end of the valve core 20 facing the first pipe section 11, so that the end of the valve core 20 facing the first pipe section 11 can block the first pipe section 11. When the end of the valve core 20 facing the second pipe section 13 abuts against the second pipe section 13, the gradually increasing grooves have a certain depth to connect the second pipe section 13 and the enlarged diameter pipe section 12.

[0046] In some examples, optionally, a first limiting portion 221 is provided at the end of the limiting member 22 facing away from the first pipe section 11. The first limiting portion 221 extends out of the end of the main body 21 facing away from the first pipe section 11 and is used for limiting cooperation with the second pipe section 13, so as to prevent the valve core 20 from continuing to move in the direction close to the second pipe section 13 when it is in the open state.

[0047] This structure enables a space for liquid to flow to be formed between the main body and the second pipe section 13 when the first limiting portion 221 abuts against the second pipe section 13 for limiting. This space is respectively communicated with the second pipe section 13 and a plurality of flow channels 23. Compared with the method of only using the flow channels 23 for refrigerant flow, the flow rate of the refrigerant when the one-way valve 100 is in the open state can be increased.

[0048] In some examples, optionally, the first limiting portion 221 is connected to the end surface of the main body 21 facing the second pipe section 13. This structure enables the surface of the first limiting portion 221 facing the second pipe section 13 to have a larger radial dimension, so that it is more convenient for the first limiting portion 221 to perform limiting cooperation with the second pipe section 13.

[0049] In order to better block the first pipe section 11, in this embodiment, the main body 21 is designed to include a connected first part 211 and a second part 212. The first part 211 and the second part 212 are integrally formed during processing, or integrally connected by means such as welding and heat fusion connection after processing. The second part 212 may be a structure with a hollow interior and an open end facing the second pipe section 13.

[0050] The first part 211 is disposed close to the second pipe section 13. A plurality of limiting members 22 are connected to the first part 211 and can extend to the junction of the first part 211 and the second part 212.

[0051] The second part 212 is disposed close to the first pipe section 11. Along the end of the second part 212 close to the first part 211 to the end away from the first part 211, the radial dimension of the second part 212 gradually decreases. So that the second part 212 forms a frustum structure. The maximum radial dimension of the second part 212 is greater than or equal to the inner diameter of the first pipe section 11, so that the second part 212 forms a plug-like structure that can partially extend into the first pipe section 11, thereby achieving better blocking of the first pipe section 11.

[0052] In some examples, optionally, an inclined surface 222 that is smoothly transitionally connected to the outer wall surface of the first part 211 is provided at one end of the limiting member 22 close to the first part 211. The radial dimension of the inclined surface 222 gradually increases in the direction away from the second part 212 to be slightly smaller than the inner diameter of the enlarged diameter pipe section 12. When the valve core 20 moves in the direction close to the first pipe section 11, the inclined surface 222 can play a certain guiding role to facilitate the movement of the valve core 20 towards the first pipe section 11.

[0053] Moreover, when the first pipe section 11 and the enlarged diameter pipe section 12 of this embodiment are connected by a small diameter-changing structure 121, the diameter-changing structure 121 can be regarded as a part of the enlarged diameter pipe section 12. The inclined surface 222 can also be in guiding cooperation with the inner wall of the diameter-changing structure 121. The diameter-changing structure 121 refers to a small pipe body between the first pipe section 11 and the enlarged diameter pipe section 12. Along the end of the diameter-changing structure 121 connected to the first pipe section 11 to the end of the diameter-changing structure 121 connected to the enlarged diameter pipe section 12, the radial dimension of the diameter-changing structure 121 gradually increases to form a frustum-like structure.

[0054] The first pipe section 11 and the enlarged diameter pipe section 12 of this embodiment may be integrally formed or integrally connected. After processing the first pipe section 11 and the enlarged diameter pipe section 12, the valve core 20 of this embodiment is placed in the enlarged diameter pipe section 12, and then the second pipe section 13 is processed.

[0055] For the convenience of processing and to facilitate the limiting cooperation between the first limiting portion 221 and the second pipe section 13, the second pipe section 13 with a smaller radial dimension can be directly inserted into the expanded-diameter pipe section 12 to achieve the insertion connection between the second pipe section 13 and the expanded-diameter pipe section 12. The insertion connection method is convenient to operate, which can improve production efficiency and reduce production costs.

[0056] Of course, after the second pipe section 13 is inserted into the expanded-diameter pipe section 12, the connection between the two can also be strengthened by welding or through a connecting member (not shown in the figure), and specific examples are not listed one by one in this embodiment.

[0057] Combined with the attached Figure 5 As shown, when the valve core 20 is in the open position, the end of the valve core 20 facing the second pipe section 13 is in limiting cooperation with the annular end face of the end of the second pipe section 13 inserted into the expanded-diameter pipe section 12.

[0058] In some examples, optionally, a second limiting portion 131 is provided on the outer wall surface of the second pipe section 13 of this embodiment. The second limiting portion 131 may include a raised structure, and the raised form may be an annular or semi-annular flange provided along the circumferential direction of the outer wall surface of the second pipe section 13. Of course, the second limiting portion 131 of this embodiment may also be a dot-shaped protrusion, and the number of dot-shaped protrusions may be one or more, and multiple dot-shaped protrusions are arranged at intervals along the circumferential direction of the outer wall surface of the second pipe section 13.

[0059] The second limiting portion 131 is used for limiting cooperation with the end of the expanded-diameter pipe section 12 facing away from the first pipe section 11 to prevent the second pipe section 13 from being inserted too deeply when inserted into the expanded-diameter pipe section 12, and by observing the position of the second limiting portion 131, it can also prevent the situation that the second pipe section 13 is inserted too shallowly when inserted into the expanded-diameter pipe section 12, which affects the connection stability between the two.

[0060] In addition to inserting the second pipe section 13 into the expanded-diameter pipe section 12, the first pipe section 11, the expanded-diameter pipe section 12, and the second pipe section 13 can also be designed as an integrally formed structure, that is, the three are integrally formed by injection molding or hot melting and other methods, and then the diameters of the first pipe section 11 and the second pipe section 13 are reduced by a spinning process, so that the inner diameters of the first pipe section 11 and the second pipe section 13 are both smaller than the inner diameter of the expanded-diameter pipe section 12.

[0061] To facilitate the connection of the one-way valve 100 of this embodiment to other pipelines, a first flared structure 111 may also be provided at the end of the first pipe section 11 of this embodiment facing away from the flared pipe section, and the inner diameter of the first flared structure 111 is greater than the inner diameter of the remaining part of the expanded-diameter pipe section 12.

[0062] There are two implementation manners in which the inner diameter of the first flaring structure 111 is larger than the inner diameter of the remaining part of the first pipe segment 11. One is that the inner diameter (radial dimension of the inner wall surface) of the first flaring structure 111 is larger than the inner diameter of the remaining part of the first pipe segment 11, and at the same time, the outer diameter of the first flaring structure 111 is also larger than the outer diameter of the remaining part of the first pipe segment 11. At this time, the wall thickness of the first pipe segment 11 can be equal. The other is that the inner diameter of the first flaring structure 111 is larger than the inner diameter of the remaining part of the first pipe segment 11, and at the same time, the outer diameter of the first flaring structure 111 is not larger than the outer diameter of the remaining part of the first pipe segment 11. At this time, the wall thickness of the first pipe segment 11 becomes thinner at the first flaring structure 111.

[0063] Similarly, a second flaring structure 132 can also be provided at one end of the second pipe segment 13 away from the first pipe segment 11, and the inner diameter of the second flaring structure 132 is larger than the inner diameter of the remaining part of the expanded diameter pipe segment 12. The designs of the first flaring structure 111 and the second flaring structure 132 can enable the one-way valve 100 to be connected to a pipeline with a larger radial dimension, thereby facilitating the one-way valve 100 to dock with structures such as a compressor and a four-way valve.

[0064] Based on the above one-way valve 100, the present utility model provides an outdoor unit of a heating, ventilation and air conditioning (HVAC) device, including a housing, a heat exchanger, a compressor, a four-way valve (not shown in the figure), and a one-way valve 100 according to any one of the above technical solutions; two compressors, two heat exchangers, a four-way valve, and a one-way valve 100 are located inside the housing. The four-way valve has two first communication ports and two second communication ports. One first communication port, one one-way valve 100, and one of the compressors are connected in sequence, and the other first communication port, the other one-way valve 100, and the other compressor are connected in sequence. One second communication port is connected to one of the heat exchangers, and the other second communication port is connected to the other heat exchanger. Since the housing, heat exchanger, compressor, and four-way valve of the outdoor unit of the HVAC device can refer to related technologies, no drawings are provided for this embodiment.

[0065] Based on the above outdoor unit of the HVAC device, the present embodiment also provides an HVAC device, including the outdoor unit of the HVAC device shown in the above technical solution. In some embodiments, the HVAC device further includes an indoor unit of the HVAC device (not shown in the figure). For the structure of the indoor unit of the HVAC device and other parts of the HVAC device except the indoor unit and the outdoor unit of the HVAC device, please refer to related technologies, and details are not described herein again.

[0066] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A one-way valve, characterized in that: include: A valve pipe, comprising a first pipe section, an enlarged pipe section and a second pipe section which are connected and communicated in sequence, wherein the inner diameter of the enlarged pipe section is larger than the inner diameters of the first pipe section and the second pipe section; The valve core is located in the expanded diameter pipe section and can move between an open position and a closed position. The outer wall surface of the valve core is provided with a flow channel. When the valve core is in the closed position, the end of the valve core facing the first pipe section blocks the first pipe section to cut off the connection between the first pipe section and the expanded diameter pipe section. When the valve core is in the open position, the first pipe section is connected to the expanded diameter pipe section, and the end of the valve core facing the second pipe section is limitedly matched with the second pipe section, and the flow channel connects the expanded diameter pipe section and the second pipe section.

2. The one-way valve according to claim 1, characterized in that: The valve core includes a main body and at least one limiter, the radial dimension of the main body is greater than or equal to the inner diameter of the first pipe segment, the end of the main body facing the first pipe segment is used to seal the first pipe segment, and the limiter is arranged on the outer wall surface of the main body and encloses at least a portion of the flow channel together with the outer wall surface of the main body.

3. The one-way valve according to claim 2, characterized in that: There are multiple limiters, which are circumferentially spaced apart on the outer wall of the body. Two adjacent limiters and the outer wall of the body form a flow channel, and the limiters are used to cooperate with the second pipe section in a limiting manner.

4. The one-way valve according to claim 3, characterized in that: A first limiting portion is provided at one end of each limiting member away from the first pipe section. The first limiting portion extends from one end of the body away from the first pipe section and is used for limiting cooperation with the second pipe section.

5. The one-way valve according to claim 4, characterized in that: The end surface of the main body facing the second pipe section is connected to the first limiting portion.

6. The one-way valve according to claim 2, characterized in that: The main body includes a first part and a second part that are connected. Compared with the second part, the first part is arranged close to the second pipe segment. The limiting member is connected to the first part and intersects with the first part. The second part is arranged close to the first pipe segment. The radial size of the second part gradually decreases from one end of the second part close to the first part to the end away from the first part.

7. The one-way valve according to claim 6, characterized in that: An end of the limiting member close to the second portion is provided with an inclined surface smoothly transitionally connected to the outer wall surface of the second portion.

8. The one-way valve according to any one of claims 1 to 7, characterized in that: One end of the second pipe segment is inserted into the expanded pipe segment and connected to the first pipe segment. When the valve core is in the open position, one end of the valve core facing the second pipe segment is limitedly matched with one end of the second pipe segment inserted into the expanded pipe segment.

9. The one-way valve according to claim 8, characterized in that: A second limiting portion is provided on the outer wall surface of the second pipe section, and the second limiting portion is used for limiting cooperation with an end of the first pipe section away from the expanded diameter pipe section.

10. The one-way valve according to claim 9, characterized in that: The second limiting portion includes a protrusion.

11. The one-way valve according to any one of claims 1 to 7, characterized in that: A first flaring structure is provided at one end of the first pipe segment facing away from the second pipe segment, and the inner diameter of the first flaring structure is larger than the inner diameter of the rest of the first pipe segment, and / or a second flaring structure is provided at one end of the second pipe segment facing away from the first pipe segment, and the inner diameter of the second flaring structure is larger than the inner diameter of the rest of the second pipe segment.

12. The one-way valve according to any one of claims 1 to 7, characterized in that: The first pipe section, the expanded diameter pipe section and the second pipe section are an integrally formed structure.

13. An outdoor unit of a heating and ventilation equipment, characterized in that: It comprises a shell, a heat exchanger, a compressor, a four-way valve and a one-way valve as claimed in any one of claims 1 to 12; The compressor, the heat exchanger, the four-way valve and the one-way valve are located in the shell. The four-way valve has a first connecting port and a second connecting port. The first connecting port, the one-way valve and the compressor are connected in sequence. The second connecting port is connected to the heat exchanger.

14. A HVAC equipment, characterized in that: It comprises a HVAC equipment indoor unit and a HVAC equipment outdoor unit as claimed in claim 13, wherein the HVAC equipment indoor unit and the HVAC equipment outdoor unit are connected via a pipeline.

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