shutoff valve

Abstract

A gate valve includes a valve body, a valve stem, and a connecting nut. The connecting nut is threadedly connected to the valve body. The gate valve has a first channel and a second channel. The valve body has a valve body cavity, and at least a portion of the valve stem is located in the valve body cavity. The connecting nut is threadedly connected to the valve body. When the connecting nut is screwed into the valve body, it can directly or indirectly push the valve stem relative to the valve body towards the valve body cavity to connect the first channel and the second channel. The gate valve also includes a reset element located in the valve body cavity. The reset element can push the valve stem towards the direction in which the connecting nut is screwed out to cut off the connection between the first channel and the second channel. No additional adjustment of the valve stem is required, which simplifies the assembly process and valve stem adjustment.

Description

Technical Field

[0001] This invention relates to an air conditioning system component, specifically to a shut-off valve. Background Technology

[0002] A shut-off valve is used in air conditioning systems and is generally fixedly connected to the outdoor unit. It connects and seals the outdoor and indoor units. When the air conditioner needs to be moved, the connection to the indoor unit can be disconnected, the shut-off function can be used to shut off the system, and then the connection can be reconnected during installation. The shut-off valve includes a valve body and a valve stem. The valve body includes interfaces, two of which are used to connect to the indoor or outdoor unit, and the third interface is used to install the valve stem. The valve stem adjusts the connection between the indoor and outdoor units, allowing the connection to be opened or closed. This requires the valve stem to be installed on the valve body, and then the valve stem needs to be manually adjusted according to the connection requirements. Summary of the Invention

[0003] The purpose of this application is to provide a shut-off valve that simplifies pipeline assembly and valve stem adjustment.

[0004] To achieve the above objectives, this application adopts the following technical solution: a shut-off valve, comprising a valve body, a valve stem, and a connecting nut, wherein the connecting nut is threadedly connected to the valve body, and the valve body has a first channel and a second channel; the valve stem is located within the first channel or the second channel, and the valve stem is sealed to the first channel; the connecting nut, when screwed into the valve body, can directly or indirectly push the valve stem to move relative to the valve body, thereby connecting the first channel and the second channel; the shut-off valve further comprises a reset element, which can push the valve stem to move in the direction of screwing out the connecting nut, thereby cutting off the first channel and the second channel.

[0005] In this application, when the connecting pipe is connected to the valve body via the connecting nut, the connecting nut can push the valve stem to run, connecting the first channel and the second channel, so that the pipeline connected to the first channel and the second channel is connected. The reset element can push the valve stem to cut off the first channel and the second channel. There is no need to adjust the valve stem of the shut-off valve, which is beneficial to simplify the assembly process and valve stem adjustment. The shut-off valve can autonomously realize the connection and shut-off functions under the action of the connecting nut and the reset element. Attached Figure Description

[0006] Figure 1 This is a cross-sectional structural diagram of the first embodiment of the shut-off valve;

[0007] Figure 2 This is a cross-sectional structural diagram of the second embodiment of the shut-off valve;

[0008] Figure 3 This is a cross-sectional structural diagram of the third embodiment of the gate valve;

[0009] Figure 4 This is a cross-sectional structural diagram of the fourth embodiment of the gate valve;

[0010] Figure 5 This is a cross-sectional structural diagram of the fifth embodiment of the shut-off valve;

[0011] Figure 6 This is a schematic diagram showing the state of the shut-off valve and connecting pipe in the first position;

[0012] Figure 7 This is a schematic diagram showing the state of the shut-off valve and connecting pipe in the second position;

[0013] Figure 8 This is a schematic diagram showing the state of the shut-off valve and connecting pipe in the third position. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0015] A shut-off valve is used in air conditioning systems and is typically fixedly connected to the outdoor unit. It connects and seals the outdoor and indoor units, allowing the air conditioner to be moved. When relocation is required, the connection to the indoor unit can be disconnected, the shut-off function used to shut off the system, and then reconnected during installation. Shut-off valves can also perform refrigerant charging and system vacuuming functions. In this case, the shut-off valve also has a charging head, which connects to a specific tooling system for charging refrigerant and vacuuming.

[0016] See Figure 1 In this embodiment, the shut-off valve 100 includes a valve body 11, a valve stem 12, a connecting nut 13, and a reset element 14. The connecting nut 13 is threadedly connected to the valve body 11. The shut-off valve 100 has a first channel 101 and a second channel 102. The valve body 11 has a valve body cavity 110. Part of the valve stem 12 is located in the valve body cavity 110. The connecting nut 13 can be screwed into relative to the valve body 11 to directly or indirectly push the valve stem 12 to move relative to the valve body 11, so as to connect the first channel 101 and the second channel 102. The reset element 14 is located in the valve body cavity 110. The reset element 14 can push the valve stem 12 to move in the direction of screwing out of the connecting nut 13, so as to cut off the connection between the first channel 101 and the second channel 102. In this embodiment, the valve stem is moved directly or indirectly by the connecting nut to connect the first channel and the second channel; the reset element can push the valve stem to move in the direction of the connecting nut being turned out to cut off the first channel and the second channel; the connecting nut is used in conjunction with the valve body to adjust the valve stem, without the need for additional manual adjustment of the valve stem. The structure is simple and the operation is convenient. The shut-off valve can automatically achieve the functions of connecting and shutting off under the action of the connecting nut and the reset element.

[0017] Combination Figure 1 and Figure 3The shut-off valve 100 has a first connecting end 118 and a second connecting end 119. The first connecting end 118 is connected to the first channel 101, and the second connecting end 119 is connected to the second channel 102. The first connecting end 118 can be connected to the indoor unit of the air conditioner, and the second connecting end 119 can be connected to the outdoor unit of the air conditioner. In this embodiment, the indoor unit of the air conditioner is detachably connected to the first connecting end 118 of the shut-off valve 100 via a connecting pipe 70, and the outdoor unit of the air conditioner is welded to the second connecting end 119 via another connecting pipe. Figures 6 to 8 The connecting pipe 70 includes a flared portion 71, which is located between the connecting nut 13 and the valve stem 12. To increase the sealing at the connection point, a sealing element, such as a soft seal, can be added. See also Figure 6 When the connecting nut 13 is screwed into the valve body 11, the connecting nut 13 pushes the horn 71, the horn 71 pushes the valve stem 12, and the valve stem 12 moves along the axial direction of the valve body 11 toward the second connecting end 119 under the pressure of the horn 71.

[0018] In this embodiment, the valve stem 12 has a communicating cavity 121, the first channel 101 includes the communicating cavity 121, the communicating cavity 121 forms a first communicating hole 121 at the first end 120 of the valve stem, the communicating cavity 121 forms a second communicating hole 122 on the side wall of the valve stem, and a sealing structure is formed at the connection of the side wall of the valve body cavity below the second communicating hole, that is, the second sealing ring is located below the second communicating hole 122.

[0019] When the indoor and outdoor units of the air conditioner are not connected, i.e., when the first and second channels are not connected, i.e., when the first and second channels are in a closed state, a sealing structure is formed at the connection between the valve stem 12 and the side wall forming the valve body cavity. See [link / reference]. Figure 1 and Figure 3In this embodiment, the sealing structure includes a dynamic seal between the sealing ring and the valve body. Specifically, the shut-off valve 100 further includes a first sealing ring 16 and a second sealing ring 17. Both the first sealing ring 16 and the second sealing ring 17 are sleeved on the valve stem 12 and connected to the valve stem 12 for limiting. In this embodiment, the valve stem 12 includes a first stem portion 123 and a second stem portion 124, which are connected as a whole. The first stem portion 123 has a first mounting groove 125, and the second stem portion 124 has a second mounting groove 126. The first sealing ring 16 is located in the first mounting groove 125. The second sealing ring 17 is located in the second mounting groove 126, and the reset element 14 and the second connecting hole 122 are located between the first mounting groove 125 and the second mounting groove 126; the sealing structure between the valve stem 12 and the valve body 11 includes a dynamic seal between the second sealing ring 17 and the valve body 11, and a dynamic seal between the first sealing ring 16 and the valve body 11. The dynamic seal between the first sealing ring 16 and the valve body 11 prevents leakage of the valve body cavity 110 through the connection between the valve stem 12 and the valve body 11; wherein the sealing structure used to block the first channel and the second channel is the seal between the second sealing ring 17 and the valve body 11.

[0020] To control the connection between the first and second channels, when the connecting nut 13 is below a preset position, the first channel 101 and the second channel 102 are connected. When the connection area between the first and second channels is at its maximum, a portion of the lower side of the flared section is pressed against the inclined surface of the valve body by the connecting nut, and the remaining portion of the lower side of the flared section is pressed against the valve stem by the connecting nut, which facilitates the sealing of the connecting pipe. The preset position includes a warning line L on the valve body 11, which can be laser-printed on the side wall of the valve body. This provides a reference when the shut-off valve is in use. (See [reference]). Figure 7 The connecting nut is located at the indicator line L. In this embodiment, in order to connect the first channel 101 and the second channel 102, the valve body 11 has a flared portion 116 near the second connecting end 119, so that the valve stem 12 and the flared portion 116 form a gap, that is, the outer side of the second sealing ring forms a gap with the flared portion. The flared portion 116 has a transition portion 117 upward, and the transition portion 117 has a sealing section 115 upward. The length of the sealing section 115 is theoretically the distance from the thread start point O of the valve body to the indicator line L. Figure 7 When the connecting nut 13 is in position L (indicating indicator line), the first channel 101 and the second channel 102 are still in the off state. Before this position, connecting the indoor unit to the first channel 101 allows for vacuuming the indoor unit. After this position, refer to [further instructions]. Figure 8As the valve stem 12 continues to descend, the first channel 101 and the second channel 102 are connected through the gap between the flared part 116 and the outer side of the second sealing ring, thus connecting the indoor unit and the outdoor unit. Alternatively, the first connection end may not be connected to a connecting pipe, but instead connected to a plug. The plug is connected to and sealed to the valve body 11 through the connecting nut 13. When the first channel 101 and the second channel 102 are connected through the gap between the flared part and the second sealing ring, the outdoor unit can be evacuated and charged with refrigerant.

[0021] For evacuating and charging the refrigerant into the outdoor unit, the shut-off valve 100 also includes a valve core 31, see [link / reference]. Figure 3 The valve body 11 includes a third connecting end 32 and a third channel 103. The third channel 103 forms a connecting hole 33 at the third connecting end 32. The valve core 31 extends into the third channel 103 through the connecting hole 33. The third channel 103 is connected to the first channel 101. The valve core 31 can be used to evacuate the first channel or the indoor unit connected to the first channel. When the first channel 101 is connected to the second channel 102, the valve core 31 can be used to charge refrigerant or evacuate the second channel or the outdoor unit connected to the second channel.

[0022] See Figure 8 When connected to the connecting pipe of the indoor unit, when the connecting nut is tightened or fully tightened, the upper side of the flared part contacts the connecting nut, part of the lower side of the flared part presses against the inclined surface 131 of the valve body, and the other part of the lower side of the flared part presses against the valve stem; when connected to the plug, when the connecting nut is tightened or fully tightened, the upper side of the plug contacts the connecting nut, part of the lower side of the plug presses against the inclined surface 131 of the valve body, and the other part of the lower side of the plug presses against the valve stem, which helps to form a seal between the three.

[0023] In this embodiment, the reset element 14 is a spring, see [link / reference]. Figure 1 , Figure 3To limit and reset the element, the valve stem 12 has a first limiting portion 34, which is a stepped surface formed on the valve stem 11. The first limiting portion 34 is located below the first sealing ring 16. The valve body 11 has a second limiting portion 35, which is located in the valve body cavity 110. The reset element 14 is located between the first limiting portion 34 and the second limiting portion 35, and abuts against the first limiting portion 34 and the second limiting portion 35. The second limiting portion 35 is a flange formed in the valve body cavity. Since the flange extends into the valve body cavity, the first sealing ring 16... Both the sealing ring and the second sealing ring are installed and limited with the valve stem. In order to ensure sealing and flow, the valve stem 12 is I-shaped, and the outer shape of both ends of the valve stem is larger than the inner edge of the second limiting part. Therefore, in this embodiment, the valve stem 12 includes a first rod part 123 and a second rod part 124. The first rod part 123 and the second rod part 124 are connected as a whole. The first limiting part 34 is formed on the first rod part 123, and the second connecting hole 122 is formed on the second rod part 124. The outer wall of the second rod part where the second connecting hole 122 is located is provided with a gap M between it and the side wall forming the valve body cavity.

[0024] Figure 1 and Figure 3 In the implementation method, since the third channel 103 and the first channel 101 are connected, it is beneficial to evacuate the indoor unit after the connection between the indoor unit and the shut-off valve is completed. For charging the outdoor unit with refrigerant and evacuating the vacuum, the tool has a copper plug, or each shut-off valve is equipped with a plug, which is connected to the valve body by a connecting nut. That is, the plug is pressed between the connecting nut and the valve body. By tightening the connecting nut, the first channel and the second channel are connected, thereby evacuating the outdoor unit and charging the refrigerant.

[0025] Figure 2 and Figure 4 The shut-off valve, and Figure 1 and Figure 3 Compared with the previous implementation, the main difference is that the valve stem 12 can be an integral structure, without the need to assemble the valve stem into a component, which simplifies the process; the second sealing ring 17 is connected to the valve body 11 for limiting, which reduces the diameter and weight of the valve body and helps to reduce costs.

[0026] See details Figure 2 and Figure 4The valve stem 12 is an integral structure. The shut-off valve 100 also includes a first sealing ring 16 and a second sealing ring 17. The valve stem 12 has a first mounting groove 125, and the valve body 11 has a second mounting groove 126. The first sealing ring 16 is located in the first mounting groove 125, and the second sealing ring 17 is located in the second mounting groove 126. The reset element 14 is located between the first mounting groove 125 and the second mounting groove 126. The first sealing element 16 and the valve body 11 form a seal, and the second sealing ring 17 and the valve stem 12 form a seal. When the second connecting hole 122 is below the second sealing ring 17, the first channel 101 and the second channel 102 are connected. In order to ensure unobstructed communication, the valve body may also include a flared portion 116. The shut-off valve 100 also includes a valve core 31, and the valve body 11 includes a third connecting end 32. The valve body 11 has a third channel 103, and the third channel 103 forms a connecting hole 33 at the third connecting end 32. The valve core 32 extends into the third channel 103 through the connecting hole 33. The third channel 103 communicates with the first channel 101, and the first channel 101 can be evacuated or charged through the valve core. When the first channel is connected to the second channel, the second channel can be charged with refrigerant or evacuated through the valve core. It should be noted that in this embodiment, the connection between the first channel and the second channel requires the second connecting hole to be located below the sealing ring. To ensure that the sealing ring is confined within the second groove, the sealing ring may have a skeleton. To facilitate the installation of the sealing ring, the sealing ring may have an opening, which closes after installation.

[0027] See Figure 5 ,and Figure 2 and Figure 4 Compared to the previous implementation, the main difference lies in the following: before the preset position, the third channel 103 is connected to the second channel 102; after the preset position, the first channel 101 is connected to the second channel 102. In this embodiment, the preset position can also be the location of the indicator line. Refrigerant can be charged into the outdoor unit before the indicator line, and a vacuum can be evacuated from the indoor unit below the indicator line. Specifically, the shut-off valve also includes a valve core 31, and the valve body 11 includes a third connecting end 32. The valve body 11 has a third channel 103, and the third channel 103 forms a connecting hole 33 at the third connecting end 32. The valve core 31 extends into the third channel 103 through the connecting hole 33. The third channel 103 is connected to the second channel 102, and refrigerant can be charged into the second channel 102 through the valve core 31. The shut-off valve 100 also includes a third sealing ring 127 and a third mounting groove 128. The third mounting groove 128 is formed in the valve body 11, and the valve stem 12 can form a sealing structure with the third sealing ring 127. When the valve stem 12 and the third sealing ring 127 form a sealing structure, the first channel 101 is connected to the third channel 103, and the first channel can be evacuated through the valve core.

[0028] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A shut-off valve, comprising a valve body, a valve stem, and a connecting nut, wherein the connecting nut is threadedly connected to the valve body, the shut-off valve having a first channel and a second channel, the valve body having a valve body cavity, a portion of the valve stem being located in the valve body cavity, the connecting nut being screwed into the valve body to directly or indirectly push the valve stem to move relative to the valve body, thereby connecting the first channel and the second channel; the valve stem having a communicating cavity, the first channel including the communicating cavity, the communicating cavity forming a first communicating hole at a first end of the valve stem, the communicating cavity forming a second communicating hole on a side wall of the valve stem, a sealing structure being formed at the connection point forming the side wall of the valve body cavity below the second communicating hole, the first channel and the second channel being connected when the connecting nut is below a preset position; the shut-off valve further comprising a reset element located in the valve body cavity, the reset element being capable of pushing the valve stem to move in the direction of screwing out the connecting nut, thereby cutting off the connection between the first channel and the second channel.

2. The shut-off valve according to claim 1, characterized in that: The first channel is connected to the indoor unit of the air conditioner via a connecting pipe. The connecting pipe includes a flared section, which is located between the connecting nut and the valve stem. The connecting nut is screwed into the valve body, thereby pressing the flared section against the valve stem. Under the pressure of the flared section, the valve stem moves into the valve body cavity. When the indoor unit of the air conditioner and the second channel are not connected, a sealing structure is formed at the connection between the valve stem and the side wall forming the valve body cavity.

3. The shut-off valve according to claim 2, characterized in that: When the communication area between the first channel and the second channel is at its maximum, a portion of the lower side of the horn section is pressed against the inclined surface of the valve body by the connecting nut, and the other portion of the lower side of the horn section is pressed against the valve stem by the connecting nut.

4. The shut-off valve according to any one of claims 1-3, characterized in that: The valve stem has a first limiting portion, which is a stepped surface formed on the valve stem. The valve body has a second limiting portion, which is located in the valve body cavity. The reset element is located between the first limiting portion and the second limiting portion, and the reset element abuts against the first limiting portion and the second limiting portion.

5. The shut-off valve according to claim 4, characterized in that: The valve stem has a communicating cavity, and the communicating cavity forms a second communicating hole on the side wall of the valve stem. The second limiting part is a flange formed in the valve body cavity. The valve stem includes a first rod part and a second rod part, which are connected as a whole. The first limiting part is formed in the first rod part, and the second communicating hole is formed in the second rod part. The outer wall of the second rod part where the second communicating hole is located is spaced apart from the side wall forming the valve body cavity.

6. The shut-off valve according to claim 5, characterized in that: The shut-off valve further includes a first sealing ring and a second sealing ring. The first rod portion has a first mounting groove, and the second rod portion has a second mounting groove. The first sealing ring is located in the first mounting groove, and the second sealing ring is located in the second mounting groove. The reset element and the second connecting hole are located between the first mounting groove and the second mounting groove. The shut-off valve includes a sealing structure, which includes a dynamic seal between the second sealing ring and the valve body.

7. The shut-off valve according to claim 5, characterized in that: The shut-off valve includes a sealing structure, the valve stem is an integral structure, and the shut-off valve also includes a first sealing ring and a second sealing ring. The first stem portion has a first mounting groove, and the second stem portion has a second mounting groove. The first sealing ring is located in the first mounting groove, and the second sealing ring is located in the second mounting groove. The reset element is located between the first mounting groove and the second mounting groove. The sealing structure includes a dynamic seal between the second sealing ring and the valve stem. When the second connecting hole is below the second sealing ring, the first channel and the second channel are connected.

8. The shut-off valve according to claim 6 or 7, characterized in that: The shut-off valve also includes a valve core. The valve body includes a third connecting end and has a third channel. The third channel forms a connecting hole at the third connecting end. The valve core extends into the third channel through the connecting hole. The third channel is connected to the first channel. The valve core can be used to evacuate the first channel or the indoor unit connected to the first channel. When the first channel is connected to the second channel, the valve core can be used to charge refrigerant into the second channel and the outdoor unit connected to the second channel or to evacuate it.

9. The shut-off valve according to claim 8, characterized in that: The valve body has an indicator line, and the preset position includes the position below the indicator line. When the screw-in distance of the connecting nut reaches the indicator line, the connecting nut is tightened further. The sealing structure is located in the flared part or transition part of the valve body. There is a gap at the connection between the valve stem and the valve body. The first channel and the second channel are connected. When the connecting nut is screwed in to stop, the flow area of ​​the first channel and the second channel is at its maximum.

10. The shut-off valve according to claim 7, characterized in that: The shut-off valve further includes a valve core, and the valve body includes a third connecting end. The valve body has a third channel, and the third channel forms a connecting hole at the third connecting end. The valve core extends into the third channel through the connecting hole. The third channel communicates with the second channel. Refrigerant can be charged into the second channel or the outdoor unit communicating with the second channel through the valve core. The shut-off valve also includes a third sealing ring and a third mounting groove. The third mounting groove is formed in the valve body. The valve stem can form a sealing structure with the third sealing ring. When the valve stem forms a sealing structure with the third sealing ring, the first channel communicates with the third channel. Vacuum can be evacuated into the first channel or the indoor unit communicating with the first channel through the valve core.

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