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, a reducing pipe section, a second pipe section and a third pipe section which are sequentially connected and communicated in the axial direction of the valve pipe. According to the one-way valve, the reducing pipe section is arranged between the first pipe section and the second pipe section to replace a check ring, the reducing pipe section can be matched with the valve element in a limiting mode, the reducing pipe section and the second pipe section are communicated through the flow channel, and therefore the one-way valve can be conducted in one direction; the inner diameter of the third pipe section is designed to be smaller than that of the second pipe section, the third pipe section is used for replacing an original valve seat, communication of the second pipe section and the third pipe section is cut off through sealing fit of the third pipe section and the valve element, closing of the one-way valve in the other direction is achieved, the function of the one-way valve is achieved, and meanwhile the service life of the one-way valve is prolonged. An original valve seat and check ring structure is omitted, and the structural complexity and the production cost are reduced.

Description

Technical Field

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

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

[0003] The outdoor unit of heating, ventilation and air conditioning 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 provided with a valve seat and a retaining ring in the valve tube to cooperate with the valve core to achieve one-way opening and closing of the valve tube. 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 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, a reduced-diameter tube section, a second tube section and a third tube section that are sequentially connected and communicated along its axial direction. The inner diameter of the reduced-diameter tube section is smaller than the inner diameter of the first tube section and smaller than the inner diameter of the second tube section. The inner diameter of the third tube section is smaller than the inner diameter of the second tube section. The valve core is located in the second tube section. The valve core is provided with a flow channel and can move along the axial direction of the valve tube. When the valve core moves to a state where it abuts against the reduced-diameter tube section, the valve core is in limit cooperation with the reduced-diameter tube section, and the flow channel conducts the reduced-diameter tube section, the second tube section and the third tube section. When the valve core moves to a state where it abuts against the third tube section, the valve core is in sealing cooperation with the third tube section and cuts off the communication between the second tube section and the third tube section.

[0007] According to the check valve provided by the utility model, a reduced-diameter tube section is arranged between the first tube section and the second tube section to replace the retaining ring. The reduced-diameter tube section can be in limit cooperation with the valve core, and the reduced-diameter tube section and the second tube section are communicated through the flow channel to achieve the conduction of the check valve in one direction. Moreover, the inner diameter of the third tube section is designed to be smaller than the inner diameter of the second tube section, and the third tube section is used to replace the original valve seat. The communication between the second tube section and the third tube section is cut off through the sealing cooperation between the third tube section and the valve core to achieve the closing of the check valve in the other direction. While realizing the function of the check valve, the original valve seat and retaining ring structures are cancelled, reducing the complexity of the structure and the production cost.

[0008] In addition, the one-way valve provided by the utility model may also have the following additional technical features:

[0009] In some embodiments of the present utility model, the valve core includes a main body and a sealing portion connected to the side of the main body away from the reduced diameter pipe section, and the radial dimension of the sealing portion gradually decreases along the direction away from the main body. When the valve core moves to abut against the reduced diameter pipe section, the main body and the reduced diameter pipe section are limited and cooperated. When the valve core moves to abut against the third pipe section, the sealing portion is sealed and cooperated with the third pipe section.

[0010] In some embodiments of the present invention, when the valve core moves to abut against the third pipe segment, the sealing portion seals against an inner edge of an end of the third pipe segment facing the second pipe segment.

[0011] In some embodiments of the present invention, the valve tube also includes a connecting pipe section located between the second pipe section and the third pipe section, the connecting pipe section is respectively connected to the second pipe section and the third pipe section, and the radial dimension of the connecting pipe section gradually decreases along the direction from the second pipe section to the third pipe section.

[0012] In some embodiments of the present invention, the outer wall surface of the sealing portion forms a first angle less than 90° with the axial direction, the inner wall surface of the connecting pipe section forms a second angle less than or equal to 90° with the axial direction, and the second angle is greater than the first angle.

[0013] In some embodiments of the utility model, the outer wall surface of the main body is provided with a plurality of guide members, the plurality of guide members are arranged at intervals along the circumference of the outer wall surface of the main body, and cooperate with the inner wall guide of the second pipe section, a flow channel is enclosed between two adjacent guide members and the outer wall surface of the main body, and when the valve core moves to a state where it abuts against the reduced diameter pipe section, the guide members cooperate with the inner wall limit of the reduced diameter pipe section.

[0014] In some embodiments of the utility model, a first limiting portion is provided at one end of the guide member away from the sealing portion, and the first limiting portion protrudes from the end surface of the main body facing the reduced diameter pipe section. When the valve core moves to abut against the reduced diameter pipe section, the first limiting portion cooperates with the inner wall of the reduced diameter pipe section.

[0015] In some embodiments of the present invention, the first limiting portion is connected to the end surface of the main body facing the reduced diameter pipe section.

[0016] In some embodiments of the utility model, the inner wall of the second pipe section is provided with a plurality of second limiting portions, the second limiting portions protrude from the inner wall surface of the second pipe section, at least one of the guide members is located between two adjacent second limiting portions, and cooperates with the second limiting portions to limit the axial rotation of the valve core around the valve tube.

[0017] In some embodiments of the present utility model, the one-way valve also includes a first interface section and a second interface section, the first interface section is connected to the end of the first pipe section away from the reduced diameter pipe section, the inner diameter of the first interface section is smaller than the inner diameter of the first pipe section, and the second interface section is connected to the end of the third pipe section away from the second pipe section, the inner diameter of the second interface section is smaller than or equal to the inner diameter of the third pipe section.

[0018] In some embodiments of the present invention, the first pipe segment, the reduced-diameter pipe segment, the second pipe segment, and the third pipe segment are an integrally formed structure.

[0019] In the second aspect, the utility model proposes an outdoor unit of a HVAC equipment, comprising a shell, a heat exchanger, a compressor, a four-way valve and a one-way valve as described in any one of the above technical solutions; 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, and the second connecting port is connected to the heat exchanger.

[0020] In a third aspect, the utility model proposes a HVAC equipment, comprising a HVAC equipment indoor unit and a HVAC equipment outdoor unit as shown in any one of the above technical solutions, wherein the HVAC equipment indoor unit and the HVAC equipment outdoor unit are connected by a pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0022] Figure 1 The structure diagram of the one-way valve provided according to the embodiment of the utility model is schematically shown;

[0023] Figure 2 for Figure 1 AA cross-section diagram;

[0024] Figure 3 The structure diagram of the one-way valve in an open state provided in accordance with an embodiment of the utility model is schematically shown;

[0025] Figure 4 Schematically shows a schematic structural view of a check valve provided according to an embodiment of the present utility model in a closed state;

[0026] Figure 5 Schematically shows a schematic structural view of a valve core provided according to an embodiment of the present utility model.

[0027] The reference numerals are as follows:

[0028] 100, check valve; 10, valve tube; 11, first pipe section; 12, reduced-diameter pipe section; 13, second pipe section; 131, second limiting portion; 14, third pipe section; 15, connecting pipe section; 16, first interface section; 17, second interface section; 20, valve core; 21, body portion; 211, guiding member; 2111, first limiting portion; 22, sealing portion. Detailed implementation manners

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying 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.

[0030] 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 executed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps can be used.

[0031] Although terms such as first, second, and third 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" and "second" and other numerical terms do not imply an order or sequence when used in this document. 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.

[0032] For ease of description, spatial relative relationship terms may be used herein to describe the relationship of one element or feature shown in the figure 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 figure. For example, if the device in the figure 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 above and below orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used in this document are interpreted accordingly.

[0033] Combined with the attached Figure 1 and the attached Figure 2 As shown, this embodiment provides a one-way valve 100. The one-way valve 100 can be used in the outdoor unit of a heating, ventilation, and air conditioning (HVAC) device. For example, the one-way valve 100 can be installed at at least one inlet of the four-way valve of the outdoor unit of the HVAC device and is used to connect to a compressor.

[0034] The one-way valve 100 of this embodiment includes a valve tube 10 and a valve core 20. The valve tube 10 is a tubular structure. The material of the valve tube 10 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, a reduced-diameter pipe section 12, a second pipe section 13, and a third pipe section 14 that are sequentially connected and communicated along its axial direction, that is, its length direction. In some embodiments, the axial direction refers to the extending direction of the central axis of the valve tube 10.

[0035] The inner diameter of the reduced-diameter pipe section 12 in this embodiment is smaller than the inner diameter of the first pipe section 11 and smaller than the inner diameter of the second pipe section 13. The reduced-diameter pipe section 12 can have an inner diameter that is always equal along its axial direction, or it can gradually change from one axial end of the reduced-diameter pipe section 12 to the other end, or it can gradually change from the axial center position of the reduced-diameter pipe section 12 towards both ends. As long as it can be ensured that the inner diameter of the reduced-diameter pipe section 12 is smaller than the inner diameter of the first pipe section 11 and the inner diameter of the second pipe section 13, the reduced-diameter pipe section 12 can replace the retaining ring in the related art.

[0036] The inner diameter of the third pipe section 14 in this embodiment is smaller than the inner diameter of the second pipe section 13, and, in some embodiments, the inner diameter of the third pipe section 14 is also smaller than the aforementioned first pipe section 11 and the reduced-diameter pipe section 12, so that one end of the third pipe section 14 facing the second pipe section 13 can replace the original valve seat.

[0037] It can be understood that the "inner diameter" in this embodiment refers to the diameter or the radial dimension of the inner wall surface of each pipe section.

[0038] The valve core 20 in this embodiment is located within the second pipe section 13. The valve core 20 is provided with a flow passage, and the specific structural form of the flow passage is given below. The valve core 20 can move axially along the valve to an open position and a closed position.

[0039] Combined with the attached Figure 3 As shown, when the valve core 20 is in the open position, the valve core 20 moves to abut against the reduced-diameter pipe section 12. At this time, the valve core 20 is in limit fit with the reduced-diameter pipe section 12, and the reduced-diameter pipe section 12 and the second pipe section 13 are connected through the flow passage. And at this time, the second pipe section 13 and the third pipe section 14 are also connected. At this time, the one-way valve 100 is in a one-way conduction state, and the refrigerant can flow from the third pipe section 14 to the second pipe section 13, the reduced-diameter pipe section 12, and the first pipe section 11 in sequence.

[0040] Combined with the attached Figure 4 As shown, when the valve core 20 is in the closed position, the valve core 20 moves to abut against the third pipe section 14. At this time, the valve core 20 is in sealing fit with one end of the third pipe section 14 facing the second pipe section 13 to cut off the connection between the second pipe section 13 and the third pipe section 14. At this time, the one-way valve 100 is in a one-way closed state, and the refrigerant cannot flow from the second pipe section 13 into the third pipe section 14.

[0041] The above structure sets a reduced-diameter pipe section 12 between the first pipe section 11 and the second pipe section 13 to replace the retaining ring, and uses the third pipe section 14 to replace the original valve seat to achieve the closing of the one-way valve 100 in the other direction. While realizing the function of the one-way valve 100, the original valve seat and retaining ring structures are cancelled, reducing the complexity of the structure and the production cost.

[0042] In some examples, optionally, the valve core 20 of this embodiment includes an integrally connected body portion 21 and a sealing portion 22. The body portion 21 faces the reduced-diameter pipe section 12, and the sealing portion 22 faces away from the reduced-diameter pipe section 12. The material of the body portion 21 can be metal or plastic, and the material of the sealing portion 22 can be the same as that of the body portion 21, so that the body portion 21 and the sealing portion 22 can be integrally formed during processing, or integrally connected by means such as welding or hot melting. The body portion 21 and the sealing portion 22 can also be of a hollow structure, and are open at one end of the body portion 21 facing the first pipe section 11 to reduce the weight of the valve core 20 and facilitate the movement of the valve core 20 under the action of the refrigerant flow.

[0043] Along the direction away from the body portion 21, the radial dimension of the sealing portion 22 gradually decreases, forming a frustum or conical structure. When the valve core 20 moves to a state where it abuts against the third pipe section 14, the sealing portion 22 is in sealing fit with the inner edge of one end of the third pipe section 14 facing the second pipe section 13. The inner edge of one end of the third pipe section 14 facing the second pipe section 13 is an annular edge structure. Moreover, since the shape of the sealing portion 22 is frustum or conical, the radial dimension of one end of the sealing portion 22 facing the third pipe section 14 is smaller, and it can extend into the third pipe section 14. And an annular surface on the outer peripheral surface of the sealing portion 22 can form a line seal with the annular edge. The line seal is more convenient for unsealing and achieving sealed connection compared with the surface seal.

[0044] The above-mentioned "line seal" refers to preventing leakage by forming an annular line or annular surface contact between the sealing portion 22 and the inner wall surface of the third pipe section 14. It has a smaller sealing surface, and the width of the sealing surface along the axial direction of the sealing portion 22 is usually less than 1 mm, while the surface seal is achieved by the two contacting through a larger area, and the width of the sealing surface is usually not less than 1 mm.

[0045] In order to achieve the transitional connection between the second pipe section 13 and the third pipe section 14, in some examples, optionally, the valve pipe 10 further includes a connecting pipe section 15 located between the second pipe section 13 and the third pipe section 14, and the connecting pipe section 15 is respectively connected to the second pipe section 13 and the third pipe section 14.

[0046] The connecting pipe section 15 is fixedly connected to the second pipe section 13 and the third pipe section 14 respectively. The way of fixed connection can be integrally formed by spinning or hydroforming processes during processing, or integrally connected by means such as welding.

[0047] In order to prevent the sealing portion 22 from being affected by the inner wall surface of the connecting pipe section 15 before forming a line seal at one end that has not moved to the inner wall of the third pipe section 14, this embodiment optimizes the structure of the connecting pipe section 15.

[0048] Combined with the attached Figure 2As shown, on the cross-section along the central axis of the valve tube 10, the outer wall surface of the sealing portion 22 with a frustum shape or a conical shape in the outer contour has two inclined sides in the radial direction. The radial direction is a direction perpendicular to the axial direction of the valve tube 10. The length directions of the two inclined sides of the sealing portion 22 form a first included angle a with the axial direction, and the first included angle a is an acute angle less than 90°. Similarly, the two side directions of the inner wall surface of the connecting pipe segment 15 in the radial direction form a second included angle b with the axial direction. The second included angle b can be an acute angle or a right angle. In order to prevent the inner wall surface of the connecting pipe segment 15 from contacting the outer wall surface of the sealing portion 22, the second included angle b needs to be designed to be greater than the first included angle a, so as to ensure that the annular edge formed by the sealing portion 22 and one end of the inner wall of the third pipe segment 14 is line sealing, and there will be no case of surface sealing between the sealing portion 22 and the inner wall surface of the connecting pipe segment 15.

[0049] When the second included angle b is less than 90°, the outer contour of the connecting pipe segment 15 in this embodiment is in the frustum shape shown in the figure. When the second included angle b is equal to 90°, the side walls of the connecting pipe segment 15 in this embodiment are respectively vertically connected to the second pipe segment 13 and the third pipe segment 14.

[0050] Combined with the attached Figure 2-5 As shown, the way of arranging the flow channel in the main body portion 21 and the limit cooperation between the main body portion 21 and the reduced-diameter pipe segment 12 in this embodiment can be realized by arranging guide members 211 on the main body portion 21. A plurality of guide members 211 are arranged at intervals along the circumferential direction of the main body portion 21 on the outer wall surface of the main body portion 21. The guide members 211 in this embodiment can be plate-shaped members or block-shaped members. A flow channel is formed between the outer wall surface of the main body portion 21 and two adjacent guide members 211.

[0051] Moreover, the guide members 211 in this embodiment also guide and cooperate with the inner wall surface of the second pipe segment 13 to enable the valve core 20 to slide along the axial direction of the second pipe segment 13. Specifically, at least one guide member 211 can be directly in contact with the inner wall surface of the second pipe segment 13, or a chute (not shown in the figure) is provided in the second pipe segment 13, and at least one guide member 211 is in sliding guide cooperation with the chute.

[0052] In addition, the number of the guide members 211 can also be one. When the number of the guide members 211 is one, a flow channel can be formed between the two side surfaces along the circumferential direction of the guide member 211 and the outer wall of the main body.

[0053] 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 cylinder with a radial dimension larger than that of the reduced-diameter pipe section 12 and the third pipe section 14. A groove with a depth gradually increasing or inclined in the direction close to the reduced-diameter pipe section 12 is formed on the outer wall surface of the cylinder to form a flow channel (this implementation is not shown in the figure). The groove does not extend to one end of the valve core 20 facing the third pipe section 14, so that one end of the valve core 20 facing the third pipe section 14 can be in sealing fit with the third pipe section 14. When one end of the valve core 20 facing the reduced-diameter pipe section 12 abuts against the reduced-diameter pipe section 12, the gradually increasing groove has a certain depth to communicate the reduced-diameter pipe section 12 and the second pipe section 13.

[0054] In some examples, optionally, a first limiting portion 2111 is provided at one end of the guiding member 211 away from the sealing portion 22. The first limiting portion 2111 protrudes from the end surface of the body portion 21 facing the reduced-diameter pipe section 12. In a state where the valve core 20 moves to abut against the reduced-diameter pipe section 12, the first limiting portion 2111 is in limiting fit with the inner wall of the reduced-diameter pipe section 12, thereby preventing the valve core 20 from continuing to move in the direction close to the first pipe section 11 when in the open state.

[0055] This structure enables a gap for liquid to flow to be formed between the body portion 21 and the reduced-diameter pipe section 12 when the first limiting portion 2111 abuts against the reduced-diameter pipe section 12 in a limiting manner. This gap communicates with the reduced-diameter pipe section 12 and multiple flow channels respectively. Compared with the method of only using the flow channels for refrigerant circulation, the flow rate of the refrigerant when the check valve 100 is in the open state can be increased.

[0056] In some examples, optionally, the first limiting portion 2111 is connected to the end surface of the body portion 21 facing the reduced-diameter pipe section 12, so that the surface of the first limiting portion 2111 facing the reduced-diameter pipe section 12 has a larger radial dimension, making it more convenient for the first limiting portion 2111 to be in limiting fit with the reduced-diameter pipe section 12.

[0057] Combined with the attached Figure 1 and the attached Figure 3 As shown, in some examples, optionally, a plurality of second limiting portions 131 are provided on the inner wall of the second pipe section 13. The second limiting portions 131 protrude from the inner wall surface of the second pipe section 13, and at least one guiding member 211 is located between two adjacent second limiting portions 131. For example, both guiding members 211 are located between two adjacent second limiting portions 131 and are in limiting fit with the second limiting portions 131 to limit the rotation of the valve core 20.

[0058] The second limiting portion 131 in this embodiment is formed by the side wall of the second pipe section 13 being recessed inward, forming a pit on the outer wall surface of the second pipe section 13 and a protruding second limiting portion 131 on the inner wall surface of the second pipe section 13. Therefore, the recessed position can be understood as the position of the second limiting portion 131.

[0059] In order to facilitate the connection of the one-way valve 100 to structures such as a four-way valve or a compressor, in some examples, optionally, the one-way valve 100 also includes a first interface section 16 and a second interface section 17, and the first interface section 16 and the second interface section 17 are respectively located at both ends of the valve tube 10 along the axial direction. Specifically, the first interface section 16 can be connected to the end of the first pipe section 11 away from the reduced diameter pipe section 12, and the inner diameter of the first interface section 16 is smaller than the inner diameter of the first pipe section 11, and the second interface section 17 is connected to the end of the third pipe section 14 away from the second pipe section 13, and the inner diameter of the second interface section 17 is smaller than or equal to the inner diameter of the third pipe section 14.

[0060] In some examples, optionally, the first pipe segment 11, the reduced diameter pipe segment 12, the second pipe segment 13 and the third pipe segment 14 are an integrally formed structure. For example, the first pipe segment 11, the reduced diameter pipe segment 12, the second pipe segment 13 and the third pipe segment 14 can be made of a straight pipe with a consistent extension direction of the pipe diameter, and then the inner diameters of the reduced diameter pipe segment 12 and the third pipe segment 14 are reduced by a spinning process or a water expansion process.

[0061] Similarly, the first interface section 16 and the second interface section 17 may also be integrally formed with the first pipe section 11 , the reduced diameter pipe section 12 , the second pipe section 13 and the third pipe section 14 through the above process.

[0062] Based on the above-mentioned one-way valve 100, the utility model proposes an outdoor unit of a heating and ventilation equipment, including a housing, a heat exchanger, a compressor, a four-way valve (not shown in the figure) and a one-way valve 100 as any one of the above-mentioned technical solutions; two compressors, two heat exchangers, a four-way valve and the one-way valve 100 are located in the housing, and the four-way valve has two first connecting ports and two second connecting ports, one first connecting port, one one-way valve 100 and one of the compressors are connected in sequence, another first connecting port, another one-way valve 100 and another compressor are connected in sequence, one second connecting port is connected to one of the heat exchangers, and another second connecting port is connected to another heat exchanger. Since the housing, heat exchanger, compressor and four-way valve of the outdoor unit of the heating and ventilation equipment can refer to the relevant technology, this embodiment will not be described with drawings.

[0063] Based on the above-mentioned HVAC equipment outdoor unit, this embodiment also proposes a HVAC equipment, including the HVAC equipment outdoor unit shown in the above-mentioned technical scheme. In some embodiments, the HVAC equipment also includes a HVAC equipment indoor unit (not shown in the figure). For the structure of the HVAC equipment indoor unit and other parts of the HVAC equipment except the indoor unit and the outdoor unit, please refer to the relevant technology, and this application will not go into details here.

[0064] 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 within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A one-way valve, characterized in that: include: The valve pipe comprises a first pipe section, a reduced diameter pipe section, a second pipe section and a third pipe section which are sequentially connected and communicated along the axial direction thereof, wherein the inner diameter of the reduced diameter pipe section is smaller than the inner diameter of the first pipe section and smaller than the inner diameter of the second pipe section, and the inner diameter of the third pipe section is smaller than the inner diameter of the second pipe section; A valve core is located in the second pipe section, the valve core is provided with a flow channel and can move along the axial direction of the valve tube. When the valve core moves to abut against the reduced pipe section, the valve core and the reduced pipe section are limited and matched, and the flow channel connects the reduced pipe section, the second pipe section and the third pipe section. When the valve core moves to abut against the third pipe section, the valve core and the third pipe section are sealed and matched, and the connection between the second pipe section and the third pipe section is cut off.

2. The one-way valve according to claim 1, characterized in that: The valve core includes a main body and a sealing portion connected to the side of the main body away from the reduced diameter pipe section. The radial dimension of the sealing portion gradually decreases along the direction away from the main body. When the valve core moves to abut against the reduced diameter pipe section, the main body and the reduced diameter pipe section are limitedly matched. When the valve core moves to abut against the third pipe section, the sealing portion is sealed and matched with the third pipe section.

3. The one-way valve according to claim 2, characterized in that: When the valve core moves to abut against the third pipe section, the sealing portion seals and cooperates with the inner edge of one end of the third pipe section facing the second pipe section.

4. The one-way valve according to claim 3, characterized in that: The valve tube also includes a connecting tube section located between the second tube section and the third tube section, the connecting tube section is connected to the second tube section and the third tube section respectively, and the radial dimension of the connecting tube section gradually decreases along the direction from the second tube section to the third tube section.

5. The one-way valve according to claim 4, characterized in that: The outer wall surface of the sealing portion forms a first angle less than 90° with the axial direction, and the inner wall surface of the connecting pipe section forms a second angle less than or equal to 90° with the axial direction, and the second angle is greater than the first angle.

6. The one-way valve according to any one of claims 2 to 5, characterized in that: The outer wall surface of the main body is provided with a plurality of guide members, which are arranged at intervals along the circumference of the outer wall surface of the main body and cooperate with the inner wall guide of the second pipe section. A flow channel is enclosed between two adjacent guide members and the outer wall surface of the main body. When the valve core moves to a state where it abuts against the reduced diameter pipe section, the guide members cooperate with the inner wall of the reduced diameter pipe section in a limited manner.

7. The one-way valve according to claim 6, characterized in that: A first limiting portion is provided at one end of the guide member away from the sealing portion, and the first limiting portion protrudes from the end surface of the main body facing the reduced diameter pipe section. When the valve core moves to abut against the reduced diameter pipe section, the first limiting portion cooperates with the inner wall of the reduced diameter pipe section.

8. The one-way valve according to claim 7, characterized in that: The first limiting portion is connected to the end surface of the main body facing the reduced diameter pipe section.

9. The one-way valve according to claim 6, characterized in that: The inner wall of the second pipe section is provided with a plurality of second limiting parts, and the second limiting parts protrude from the inner wall surface of the second pipe section. At least one of the guide members is located between two adjacent second limiting parts and cooperates with the second limiting parts to limit the axial rotation of the valve core around the valve tube.

10. The one-way valve according to any one of claims 1 to 5, characterized in that: The one-way valve also includes a first interface section and a second interface section, the first interface section is connected to the end of the first pipe section away from the reduced diameter pipe section, the inner diameter of the first interface section is smaller than the inner diameter of the first pipe section, and the second interface section is connected to the end of the third pipe section away from the second pipe section, the inner diameter of the second interface section is smaller than or equal to the inner diameter of the third pipe section.

11. The one-way valve according to any one of claims 1 to 5, characterized in that: The first pipe section, the reduced-diameter pipe section, the second pipe section and the third pipe section are an integrally formed structure.

12. An outdoor unit of a heating and ventilation equipment, characterized in that: comprising a shell, a first heat exchanger, a compressor, a four-way valve and a one-way valve as claimed in any one of claims 1 to 11; 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.

13. A HVAC equipment, characterized in that: It comprises a HVAC equipment indoor unit and a HVAC equipment outdoor unit as claimed in claim 12, wherein the HVAC equipment indoor unit and the HVAC equipment outdoor unit are connected via a pipeline.

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