Switching valve and refrigerating system

Abstract

The utility model discloses a switching valve and a refrigerating system. The switching valve comprises a valve body, a piston assembly and an elastic piece. The valve body is provided with an inner cavity which is provided with a first channel and a second channel. The piston assembly is movably arranged in the inner cavity and used for blocking the first channel and / or the second channel. The elastic piece is used for enabling the piston assembly to be in a balanced state, and the balanced state means that the piston assembly keeps still relative to the valve body under the condition of no fluid impact. When the piston assembly is in a balanced state, the piston assembly blocks the first channel and the second channel at the same time.

Description

Technical Field

[0001] This application relates to the technical field of valves. Specifically, it relates to a switching valve and a refrigeration system including the switching valve. Background Art

[0002] In the related art, the switching valve can move within the valve cavity of the valve body under the drive of fluid pressure. If the pressure of the fluid acting on the switching valve is small, the operating ability of the switching valve will be low, and sometimes the valve cannot be fully closed or fully opened, affecting the reliability of the valve. Utility Model Content

[0003] The embodiments of this application provide a switching valve and a refrigeration system to improve the operating ability of the switching valve.

[0004] The switching valve of the embodiments of this application includes a valve body, a piston assembly, and an elastic member. The valve body has an inner cavity, and the inner cavity has a first channel and a second channel; the piston assembly is movably disposed within the inner cavity for blocking the first channel and / or the second channel; the elastic member is used to keep the piston assembly in a balanced state; the balanced state means that: under no fluid impact, the piston assembly remains stationary relative to the valve body; wherein, when the piston assembly is in the balanced state, the piston assembly blocks both the first channel and the second channel.

[0005] According to some embodiments of this application, a partition portion is provided within the inner cavity, and the partition portion divides the inner cavity into the first channel and the second channel; the elastic member includes a first elastic portion and a second elastic portion; the first elastic portion is located within the first channel, and one end of the first elastic portion abuts against the partition portion, and the other end abuts against one end of the piston assembly; the second elastic portion is located within the second channel, and one end of the second elastic portion abuts against the partition portion, and the other end abuts against the other end of the piston assembly; the first elastic portion and the second elastic portion are used to keep the piston assembly in a balanced state.

[0006] According to some embodiments of this application, the partition portion has a guiding hole, and the guiding hole penetrates through the partition portion along the movement direction of the piston assembly; the piston assembly is movably inserted through the guiding hole.

[0007] According to some embodiments of this application, the partition portion includes a partition ring and a guiding sleeve, the partition ring is fixedly connected to the inner wall of the inner cavity and is circumferentially connected to the outer periphery of the guiding sleeve, and the guiding sleeve has the guiding hole.

[0008] According to some embodiments of the present application, the axial ends of the guide sleeve have a first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface are arranged away from each other along the movement direction of the piston assembly; the first limiting surface is configured to abut against the piston assembly when the piston assembly blocks the first channel and moves to the first extreme position, and the second limiting surface is configured to abut against the piston assembly when the piston assembly blocks the second channel and moves to the second extreme position.

[0009] According to some embodiments of the present application, the separating ring has a first ring surface and a second ring surface, and the first ring surface and the second ring surface are arranged away from each other along the movement direction of the piston assembly; the part of the guide sleeve extending out of the first ring surface is defined as the first section, and the first elastic part is sleeved on the outer periphery of the first section; the part of the guide sleeve extending out of the second ring surface is defined as the second section, and the second elastic part is sleeved on the outer periphery of the second section.

[0010] According to some embodiments of the present application, the piston assembly includes a plug rod, a first piston and a second piston. The plug rod is movably disposed through the separating portion; the first piston is connected to one axial end of the plug rod and is used to block the first channel, and the other end of the first elastic part abuts against the first piston; the second piston is connected to the other axial end of the plug rod and is used to block the second channel, and the other end of the second elastic part abuts against the second piston.

[0011] According to some embodiments of the present application, the first elastic part and the second elastic part are sleeved on the outer periphery of the plug rod.

[0012] According to some embodiments of the present application, the first piston includes a first body and a first sealing ring. The first body is connected to one axial end of the plug rod, and the first sealing ring is sleeved on the outer periphery of the first body for sealing cooperation with the first channel; the second piston includes a second body and a second sealing ring. The second body is connected to the other axial end of the plug rod, and the second sealing ring is sleeved on the outer periphery of the second body for sealing cooperation with the second channel.

[0013] The refrigeration system of the embodiment of the present application includes the switching valve described in any one of the above.

[0014] One embodiment of the above application has at least the following advantages or beneficial effects:

[0015] For the switching valve according to the embodiment of the present application, when the piston assembly is in a balanced state, both the first channel and the second channel are in a closed state, and the gap between the piston assembly and the inner wall of the valve body is zero; when fluid flows into the first channel, the maximum throttling effect can be generated due to the first channel being blocked by the piston assembly, and the fluid driving force generated by throttling is the largest. The fluid driving force pushes the piston assembly to open the second channel; or, when fluid flows into the second channel, the maximum throttling effect can be generated due to the second channel being blocked by the piston assembly, and the fluid driving force generated by throttling is the largest. The fluid driving force can push the piston assembly to open the first channel; therefore, the operating ability of the switching valve is maximally improved, and the reliability of the operation of the switching valve is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. shows an exploded schematic view of the switching valve according to the first embodiment of the present application.

[0017] Figure 2 FIG. shows a top view schematic of the switching valve according to the first embodiment of the present application.

[0018] Figure 3 FIG. shows along Figure 2 the cross-sectional view taken along the cutting line A-A in

[0019] Figure 4 FIG. shows the flow area curve diagram of the switching valve when the ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve port is > 3 / 10 when the piston assembly is in a balanced state.

[0020] Figure 5 FIG. shows the flow area curve diagram of the switching valve when the ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve port is ≤ 3 / 10 when the piston assembly is in a balanced state.

[0021] Figure 6 FIG. shows the flow resistance curve diagram of the switching valve when the ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve port is > 3 / 10 when the piston assembly is in a balanced state.

[0022] Figure 7 FIG. shows the flow resistance curve diagram of the switching valve when the ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve port is ≤ 3 / 10 when the piston assembly is in a balanced state.

[0023] Figure 8 FIG. shows a cross-sectional view of the switching valve according to the second embodiment of the present application.

[0024] Figure 9 FIG. shows a cross-sectional view of the switching valve according to the third embodiment of the present application.

[0025] Figure 10Shown is a cross-sectional view of the switching valve according to the fourth embodiment of the present application.

[0026] Figure 11 Shown is a cross-sectional view of the switching valve according to the fifth embodiment of the present application.

[0027] Figure 12 Shown is a three-dimensional schematic view of the piston assembly of the switching valve according to the fifth embodiment of the present application.

[0028] Figure 13 Shown is an exploded schematic view of the switching valve according to the sixth embodiment of the present application.

[0029] Figure 14 Shown is a cross-sectional view of the switching valve according to the sixth embodiment of the present application.

[0030] Figure 15 Shown is a schematic curve diagram of the elastic resultant force exerted by a pair of first elastic members on the piston assembly when the free lengths of the first elastic members in the switching valve according to the sixth embodiment of the present application are in three different intervals.

[0031] Figure 16 Shown is a schematic curve diagram of the elastic resultant force when a pair of first elastic members and a pair of second elastic members act on the piston assembly simultaneously.

[0032] Figure 17 Shown is an exploded schematic view of the switching valve according to the seventh embodiment of the present application.

[0033] Figure 18 Shown is a cross-sectional view of the switching valve according to the seventh embodiment of the present application. Detailed implementation manners

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0035] It can be understood that the terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or components inherent to these processes, methods, products or devices.

[0036]

Embodiment 1

[0037] As Figures 1 to 3As shown in the figure, the switching valve according to the embodiment of the present application includes a valve body 100, a piston assembly 200 and an elastic member. The valve body 100 includes an inner cavity 101 having valve ports (102a, 102b); the piston assembly 200 is movably disposed in the inner cavity 101 for blocking or opening the valve ports; the elastic member is used to keep the piston assembly 200 in a balanced state; wherein, when the piston assembly 200 is in a balanced state, a throttling channel communicating with the valve ports is formed between the piston assembly 200 and the wall of the inner cavity 101. The ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve ports ≤ 3 / 10, so that within the range from the piston assembly being in a balanced state to the valve ports being completely closed, the fluid can always generate a relatively large driving force on the piston assembly, which is beneficial to improving the operating ability of the switching valve.

[0038] Wherein, the valve ports include a first valve port 102a and a second valve port 102b, and the first valve port 102a and the second valve port 102b are arranged at intervals along the movement direction of the piston assembly 200. The piston assembly 200 is used to block the first valve port 102a and the second valve port 102b respectively. The maximum flow area of the first valve port 102a is S11, and the maximum flow area of the second valve port 102b is S12.

[0039] The maximum flow area of the valve ports refers to the fluid flow cross-sectional area when the valve ports are completely opened, that is, the opening area of the valve ports. The flow area of the throttling channel refers to the opening area of the flow area.

[0040] The elastic member includes a pair of first elastic members 310, which are respectively defined as a first elastic part and a second elastic part. The first elastic part and the second elastic part are used to maintain the stability of the piston assembly in a balanced state. And the first elastic part is used to provide a first elastic force for the piston assembly 200 to move towards the position blocking the second valve port 102b, and the second elastic part is used to provide a second elastic force for the piston assembly 200 to move towards the position blocking the first valve port 102a.

[0041] In an embodiment, when the piston assembly 200 is in a balanced state, the resultant force of the elastic forces of the first elastic part and the second elastic part acting on the piston assembly 200 and the gravity of the piston assembly 200 is zero.

[0042] As Figure 1 and Figure 3 shown in the figure, the valve body 100 may include a valve seat 120 and a valve cover 130. The valve seat 120 has an inner cavity 101, and the valve cover 130 is connected to the valve seat 120. Wherein, the present application does not limit the connection manner between the valve cover 130 and the valve seat 120, such as threaded connection, welding, interference fit, etc. Or the valve cover 130 and the valve seat 120 are integrally provided.

[0043] The valve cover 130 has a first opening 131 which communicates with the inner cavity 101. The valve seat 120 has a second opening 121 which communicates with the inner cavity 101. When the piston assembly 200 seals the first valve port 102a, the first opening 131 and the second opening 121 are not in communication; when the piston assembly 200 seals the second valve port 102b, the first opening 131 and the second opening 121 are in communication. The first opening 131 can serve as the fluid inlet of the switching valve and communicates with the outlet of the compressor. The second opening 121 can serve as the fluid outlet of the switching valve and communicates with the inlet of the compressor. The end of the valve seat 120 remote from the valve cover 130 can serve as another fluid inlet of the switching valve and can communicate with the outlet of the compressor. Therefore, the switching valve can be a three-way valve, including two fluid inlets and one fluid outlet.

[0044] As Figure 3 shown, the piston assembly 200 includes a piston rod 210, a first piston 220 and a second piston 230. The first piston 220 is connected to one end of the piston rod 210 and is used to seal the first valve port 102a. The second piston 230 is connected to the other end of the piston rod 210 and is used to seal the second valve port 102b.

[0045] In one embodiment, the first elastic part and the second elastic part are compression springs and are sleeved on the outer periphery of the piston rod 210.

[0046] As Figure 3 shown, the valve seat 120 includes two first valve sleeves 122 and a second valve sleeve 123 connected between the two first valve sleeves 122. The first valve sleeves 122 and the second valve sleeve 123 are coaxially arranged. The two ends of the second valve sleeve 123 respectively form the first valve port 102a and the second valve port 102b.

[0047] When the piston assembly 200 seals the first valve port 102a, one of the first valve sleeves 122 is sleeved on the outer periphery of the first piston 220; when the piston assembly 200 seals the second valve port 102b, the other first valve sleeve 122 is sleeved on the outer periphery of the second piston 230.

[0048] Of course, in other embodiments, the valve seat 120 may not include the first valve sleeve 122 and only have the second valve sleeve 123.

[0049] As Figure 3 shown, a partition 110 is provided in the inner cavity 101. The partition 110 separates the first valve port 102a and the second valve port 102b; the first elastic part is located between the first piston 220 and the partition 110, and one end of the first elastic part abuts against the partition 110 and the other end abuts against the first piston 220. The second elastic part is located between the second piston 230 and the partition 110, and one end of the second elastic part abuts against the partition 110 and the other end abuts against the second piston 230.

[0050] In one embodiment, the separating part 110 includes a separating ring 111 and a guide sleeve 112. The separating ring 111 is fixedly connected to the inner peripheral surface of the second valve sleeve 123 and is circumferentially connected to the outer periphery of the guide sleeve 112. The guide sleeve 112 has a guide hole 110a, and the plug rod 210 is movably disposed in the guide hole 110a of the guide sleeve 112.

[0051] In the embodiment of the present application, the plug rod 210 is in guiding cooperation with the guide sleeve 112, which improves the stability of the movement of the plug rod 210, and further improves the reliability of the valve action.

[0052] In other embodiments, the separating part 110 may also include a separating ring 111, and the separating ring 111 defines a guide hole 110a.

[0053] As Figure 3 shown, the separating ring 111 has a first annular surface 1111 and a second annular surface 1112, and the first annular surface 1111 and the second annular surface 1112 are arranged opposite to each other along the movement direction of the piston assembly 200; the part of the guide sleeve 112 extending out of the first annular surface 1111 is defined as a first section 112a, and the first elastic part is sleeved on the outer periphery of the first section 112a; the part of the guide sleeve 112 extending out of the second annular surface 1112 is defined as a second section 112b, and the second elastic part is sleeved on the outer periphery of the second section 112b.

[0054] As Figure 3 shown, the throttling channel includes a first throttling channel 410 communicating with the first valve port 102a and a second throttling channel 420 communicating with the second valve port 102b. The maximum flow area of the first throttling channel 410 is S21, and the maximum flow area of the second throttling channel 420 is S22; when the piston assembly 200 is in an equilibrium state, S21 / S11 ≤ 3 / 10 and S22 / S12 ≤ 3 / 10.

[0055] In the embodiment of the present application, the first throttling channel 410 is formed between the outer peripheral surface of the first piston 220 and the inner peripheral surface of one of the first valve sleeves 122, and the second throttling channel 420 is formed between the outer peripheral surface of the second piston 230 and the inner peripheral surface of the other first valve sleeve 122.

[0056] When the piston assembly 200 moves from the state where the flow area of the valve port is zero to the state where the valve port has the maximum flow area, the stroke is S1; when the piston assembly 200 is located between the state where the flow area of the valve port is zero and the state where the valve port has the maximum flow area, the stroke is S2, and the valve port can be the first valve port 102a or the second valve port 102b. Figure 4 and Figure 5 The abscissa in Figure 4 and Figure 5The ordinate in [figure] represents the ratio of the flow area of the valve port corresponding to different opening degrees of the switching valve to the maximum flow area of the valve port. The fluid flows into the valve port through the opening between the piston assembly 200 and the inner wall of the valve seat 120. Before the opening area reaches the opening area of the valve port, the flow area of the valve port is equal to the opening area between the piston assembly 200 and the inner wall of the valve seat 120. As the piston assembly 200 moves, when the opening area between the piston assembly 200 and the inner wall of the valve seat 120 decreases to a certain extent, the opening area between the piston assembly 200 and the inner wall of the valve seat 120 is the throttling channel area of this embodiment.

[0057] The high-pressure fluid enters the valve port through the throttling channel. After being throttled by the throttling channel, the fluid becomes low-pressure fluid, and the low-pressure fluid flows out from the second opening 121. The piston assembly 200 is subjected to the fluid pressure difference force before and after the valve port. Or the high-pressure fluid directly enters the throttling channel in the valve port and then becomes low-pressure fluid, and the low-pressure fluid flows out from the second opening 121. The piston assembly 200 is subjected to the fluid pressure difference force before and after the valve port. When the flow area of the valve port of the piston assembly 200 is zero, the fluid pressure difference before and after the valve port is F1. When the flow area of the valve port of the piston assembly 200 is between zero and the maximum flow area of the valve port, the fluid pressure difference before and after the valve port is F2. Figure 6 and Figure 7 The abscissa in [figure] represents the opening degree of the switching valve. Figure 6 and Figure 7 The ordinate in [figure] represents the value of F2 / F1 corresponding to different opening degrees of the switching valve.

[0058] For the convenience of description, in the following descriptions of Figures 4 to 7 the first valve port 102a is taken as an example. For example, Figures 4 to 7 0% in the abscissa of [figure] represents the position of the piston assembly 200 when the piston assembly 200 blocks the first valve port 102a; 100% in the abscissa represents the position of the piston assembly 200 when the first valve port 102a is fully opened.

[0059] Figure 4 、 Figure 6 In [figure], when the piston assembly 200 is in the balanced state, the ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve port > 3 / 10. It can be seen from Figure 4 that when the first valve port 102a switches from the closed state to the fully opened state, the flow area gradually and steadily increases with the increase of the opening degree. When the opening degree of the piston assembly 200 reaches 50%, the flow area of the throttling channel is smaller than the maximum flow area of the valve port. At this time, the flow area of the valve port is equal to the flow area of the throttling channel, and the ratio of the flow area of the valve port to the maximum flow area of the valve port is slightly higher than 60%, and the value of F2 / F1 at this time is about 25%.

[0060] Figure 5 、Figure 7 When the piston assembly 200 is in the equilibrium state, the ratio of the maximum flow area of the throttling passage to the maximum flow area of the valve port ≤ 3 / 10. From Figure 5 It can be seen that during the process of the first valve port 102a switching from the closed state to the fully open state, within the range where the opening of the piston assembly 200 reaches 50%, the flow area of the valve port remains basically unchanged as the valve opening stroke increases. When the opening of the piston assembly 200 reaches 55%, the flow area of the throttling passage is smaller than the maximum flow area of the valve port. At this time, the flow area of the valve port is equal to the flow area of the throttling passage, and the ratio of the flow area of the valve port to the maximum flow area of the valve port is about 8%. And at this time, the value of F2 / F1 is about 95%. Therefore, it can be clearly seen that within the range where the opening of the piston assembly 200 reaches 55%, the piston assembly 200 is subjected to an increased fluid pressure difference driving force before and after the valve port, which is beneficial to improving the operating ability of the valve. The fluid pressure difference driving force can not only overcome the elastic force exerted by the elastic member on the piston assembly 200, but also enable the piston assembly 200 to quickly switch between different working conditions. When performing the closing operation of the first valve port 102a, when the piston assembly 200 runs to the equilibrium state, a relatively large fluid pressure difference driving force can be obtained, and the fluid pressure difference driving force ensures the smooth closing of the first valve port 102a.

[0061] As Figure 5 shown, since a first throttling passage 410 is formed between the outer peripheral surface of the first piston 220 and the inner peripheral surface of the first valve sleeve 122, and S21 / S11 ≤ 3 / 10, the flow area of the first valve port 102a of the switching valve is relatively small within the opening range of 0% to 55%. When the valve opening stroke is in the range of 55% to 100%, the flow area of the first valve port 102a of the switching valve gradually increases. A relatively large fluid pressure difference driving force is generated within the opening range of 0% to 55%.

[0062] From Figure 6 it can be seen that during the process of the first valve port 102a switching from the closed state to the fully open state, F2 quickly and gradually decreases, which is not conducive to improving the operating ability of the valve.

[0063] From Figure 7 it can be seen that since a first throttling passage 410 is formed between the outer peripheral surface of the first piston 220 and the inner peripheral surface of the first valve sleeve 122, and S21 / S11 ≤ 3 / 10, F2 remains at a relatively large value within the opening range of 0% to 55%. When the opening is in the range of 55% to 100%, F2 gradually decreases, which is beneficial to pushing the piston assembly 200 from the equilibrium state to the fully closed state.

[0064] It can be seen that for the switching valve according to the embodiment of the present application, a throttling channel communicating with the valve port is formed between the piston assembly 200 and the cavity wall of the inner cavity 101. When the piston assembly 200 is in a balanced state, the ratio of the maximum flow area of the throttling channel to the maximum flow area of the valve port ≤ 3 / 10. Therefore, when the switching valve performs a switching action, within a certain valve opening stroke, the flow resistance received by the switching valve can be maintained at a relatively large value, which is beneficial to improving the action ability of the switching valve and reducing the action pressure difference.

[0065]

Embodiment II

[0066] As Figure 8 shown, the same parts of the second embodiment of the present application as those of the first embodiment will not be described in detail. The differences are as follows:

[0067] When the piston assembly 200 is in a balanced state, the throttling channel further includes a third throttling channel 430 communicating with the first valve port 102a and a fourth throttling channel 440 communicating with the second valve port 102b. The maximum flow area of the third throttling channel 430 is S31, and the maximum flow area of the fourth throttling channel 440 is S32. S31 / S11 ≤ 3 / 10, S32 / S12 ≤ 3 / 10.

[0068] Both the first piston 220 and the second piston 230 have insertion parts 240. When the piston assembly 200 is in a balanced state, the insertion part 240 of the first piston 220 extends into the first valve port 102a, and a third throttling channel 430 is formed between the outer peripheral surface of the insertion part 240 of the first piston 220 and the hole wall of the first valve port 102a. The insertion part 240 of the second piston 230 extends into the second valve port 102b, and a fourth throttling channel 440 is formed between the insertion part 240 of the second piston 230 and the hole wall of the second valve port 102b.

[0069] In the embodiment of the present application, when the piston assembly 200 is in a balanced state, not only the first throttling channel 410 and the second throttling channel 420 are provided, but also the third throttling channel 430 and the fourth throttling channel 440 are provided, further improving the action ability of the switching valve.

[0070] Of course, it can be understood that in other embodiments, the switching valve may also be provided with only the third throttling channel 430 and the fourth throttling channel 440, without providing the first throttling channel 410 and the second throttling channel 420.

[0071]

Embodiment III

[0072] As Figure 9 shown, the same parts of the third embodiment of the present application as those of the first embodiment will not be described in detail. The differences are as follows:

[0073] During the process of the piston assembly 200 blocking the valve port, the flow area of the throttling channel formed between the inner peripheral surface of the first valve sleeve 122 and the piston assembly 200 gradually decreases.

[0074] In the embodiment of the present application, during the process of the piston assembly 200 blocking the first valve port 102a, the flow area of the first throttling channel 410 gradually decreases. During the process of the piston assembly 200 blocking the second valve port 102b, the flow area of the second throttling channel 420 gradually decreases. Thus, the fluid force generated by throttling gradually increases as the piston assembly 200 gradually blocks the valve port, and the elastic force of the first elastic part gradually increases as the piston assembly 200 gradually blocks the valve port. In this way, the gradually increasing elastic force as the valve port closes can be overcome to further improve the valve operation ability.

[0075] As Figure 9 shown, the inner peripheral surface of the first valve sleeve 122 has an inner conical surface 1221. By providing the inner conical surface 1221, not only can the valve operation ability be further improved, but also the piston assembly 200 can be prevented from being stuck in the first valve sleeve 122 due to the too narrow throttling channel.

[0076]

Embodiment Four

[0077] As Figure 10 shown, the same parts of the fourth embodiment of the present application and the third embodiment will not be described in detail. The differences are as follows:

[0078] The outer peripheral surfaces of the first piston 220 and the second piston 230 of the piston assembly 200 both have a first outer conical surface 250.

[0079]

Embodiment Five

[0080] As Figure 11 shown, the same parts of the fifth embodiment of the present application and the above embodiments will not be described in detail. The differences are as follows:

[0081] The piston assembly 200 includes a plug rod 210, a first piston 220, and a second piston 230. The first piston 220 and the second piston 230 are connected to the plug rod 210 and are arranged at intervals along the axial direction of the plug rod 210. The valve body 100 has a guiding part 132, and the plug rod 210 is in guiding cooperation with the guiding part 132. In the embodiment of the present application, the guiding part 132 can guide the movement of the plug rod 210, thereby preventing the plug rod 210 from being deflected during movement and affecting the sealing performance of the piston blocking the valve port. The guiding cooperation means that there is a small gap between the plug rod 210 and the guiding part 132.

[0082] In one embodiment, the valve body 100 includes a valve cover 130 and a valve seat 120. The valve seat 120 has an inner cavity 101, and the valve cover 130 is connected to the valve seat 120. The guiding part 132 is integrally formed on the valve cover 130.

[0083] Furthermore, the first piston 220 is disposed close to the valve cover 130. The piston rod 210 has a guiding section 211, and the guiding section 211 is located on the side of the first piston 220 facing away from the second piston 230. The guiding section 211 is in guiding cooperation with the guiding portion 132.

[0084] In an embodiment, the guiding portion 132 may be a hole, and the guiding section 211 is in guiding cooperation with the inner wall surface of the hole.

[0085] As Figure 12 shown, both the first piston 220 and the second piston 230 include a first piston piece 260, a second piston piece 270, and a third piston piece 280. Among them, the second piston piece 270 is clamped between the first piston piece 260 and the third piston piece 280. The second piston piece 270 may be made of a rubber material, and the first piston piece 260 and the third piston piece 280 may be made of a metal material.

[0086] When the piston seals the valve port, the first piston piece 260 extends into the valve port. In the embodiment of the present application, when the first piston 220 seals the first valve port 102a, the first piston piece 260 of the first piston 220 extends into the first valve port 102a, and the second piston 230 is located outside the second valve port 102b; when the second piston 230 seals the second valve port 102b, the first piston piece 260 of the second piston 230 extends into the second valve port 102b, and the first piston 220 is located outside the first valve port 102a.

[0087] In an embodiment, the second piston piece 270 has a second outer conical surface 271 that is in sealing cooperation with the valve port. By sealingly cooperating the second outer conical surface 271 with the valve port, the sealing performance of the piston sealing the valve port can be improved.

[0088] As Figure 12 shown, the outer peripheral surface of the first piston piece 260 has an outer cylindrical surface 261 and two third outer conical surfaces 262. The two third outer conical surfaces 262 are symmetrically connected to both ends of the outer cylindrical surface 261 along the movement direction of the piston assembly 200. Among them, the diameter of the outer cylindrical surface 261 is slightly smaller than the diameter of the valve port.

[0089] In the embodiment of the present application, the outer peripheral surface of the first piston piece 260 has an outer cylindrical surface 261 and two third outer conical surfaces 262. On the one hand, it can prevent the first piston piece 260 from getting stuck at the edge of the valve port during the valve opening / valve closing process; on the other hand, since the two third outer conical surfaces 262 are symmetrically connected to both ends of the outer cylindrical surface 261 along the movement direction of the piston assembly 200, when assembling the first piston piece 260, there is no need to consider the front or back of the first piston piece 260, which improves the assembly efficiency.

[0090] It can be understood that the guiding portion 132, the second outer conical surface 271, the outer cylindrical surface 261 and the two third outer conical surfaces 262 in this embodiment are applicable to the switching valve of any of the above embodiments, and will not be listed one by one here.

[0091]

Embodiment VI

[0092] As Figure 13 and Figure 14 shown, the same parts of the sixth embodiment of the present application as those of the above embodiments will not be elaborated, and the differences are as follows:

[0093] The switching valve of the embodiment of the present application includes a valve body 100, a piston assembly 200 and an elastic member. The elastic member may include a pair of first elastic members 310. The pair of first elastic members 310 are used to keep the piston assembly 200 in a balanced state.

[0094] In one embodiment, the first elastic member 310 is a compression spring and is sleeved on the outer periphery of the plug rod 210.

[0095] As shown in FIG. 14, a partition portion 110 is provided in the inner cavity 101. The partition portion 110 separates the first valve port 102a and the second valve port 102b and has a guiding hole 110a; the plug rod 210 is movably inserted into the guiding hole 110a. One of the first elastic members 310 is located between the first piston 220 and the partition portion 110, and one end of the one first elastic member 310 abuts against the partition portion 110, and the other end abuts against the first piston 220. The other first elastic member 310 is located between the second piston 230 and the partition portion 110, and one end of the other first elastic member 310 abuts against the partition portion 110, and the other end abuts against the second piston 230.

[0096] As Figure 14 shown, the partition ring 111 has a first ring surface 1111 and a second ring surface 1112, and the first ring surface 1111 and the second ring surface 1112 are arranged back to back along the movement direction of the piston assembly 200; the portion of the guiding sleeve 112 extending out of the first ring surface 1111 is defined as the first section 112a, and one of the first elastic members 310 is sleeved on the outer periphery of the first section 112a; the portion of the guiding sleeve 112 extending out of the second ring surface 1112 is defined as the second section 112b, and the other first elastic member 310 is sleeved on the outer periphery of the second section 112b.

[0097] Wherein, when the piston assembly 200 blocks one of the first valve port 102a and the second valve port 102b, the lengths of the pair of first elastic members 310 are L1 and L2 respectively, L1 is greater than L2, the free length of the first elastic member 310 is L', L2 < L' ≤ (L1 + L2) / 2, or L' ≥ L1. Wherein, the "free length" refers to the length value when no external force is applied to both ends of the spring.

[0098] As shown Figure 15 in the figure, a schematic diagram of the elastic resultant force curves exerted by a pair of first elastic members 310 on the piston assembly 200 when the free lengths of the first elastic members 310 are respectively in three different intervals is shown. The three different intervals are: L’≥L1 (curve 1), (L1 + L2) / 2 < L' < L1 (curve 2), L2 < L’≤(L1 + L2) / 2 (curve 3).

[0099] Among them, Figure 15 the abscissa represents the opening degree of the switching valve, and the ordinate represents the ratio of the elastic resultant force corresponding to different opening degrees of the switching valve to the maximum elastic resultant force. The maximum elastic resultant force refers to the elastic resultant force exerted by a pair of first elastic members 310 on the piston assembly 200 when the piston assembly 200 blocks one of the first valve port 102a and the second valve port 102b. The maximum elastic resultant forces exerted on the piston assembly 200 by the three pairs of different first elastic members 310 corresponding to curve 1, curve 2, and curve 3 are all equal, that is, curve 1, curve 2, and curve 3 have the same starting point and the same ending point.

[0100] For the convenience of description, taking the first valve port 102a as an example, for example Figure 15 0% in the abscissa represents the position of the piston assembly 200 when the piston assembly 200 blocks the first valve port 102a and the second valve port 102b is fully open; 100% in the abscissa represents the position of the piston assembly 200 when the first valve port 102a is fully open and the piston assembly 200 blocks the second valve port 102b. Among them, when the abscissa is 50%, it means that the piston assembly 200 is in an equilibrium state, that is, the elastic resultant force exerted by a pair of first elastic members 310 on the piston assembly 200 is zero.

[0101] It should be noted that 0% - 50% in the abscissa represents the movement of the piston assembly 200 from the first position (blocking the first valve port 102a) to the equilibrium state, and 50% - 100% represents the movement of the piston assembly 200 from the equilibrium state to the second position (blocking the second valve port 102b).

[0102] When the operating condition is switched, at the position of 0% on the abscissa, the first valve port 102a is completely closed, the compressor is not shut down, and the high-pressure fluid starts to flow in from the bottom of the second piston 230. At this time, the pressure of the high-pressure fluid in the first valve port 102a has not started to decrease. At this time, the force that pushes the piston assembly 200 to open the first valve port 102a is mainly the sum of the elastic forces of a pair of first elastic members 310. The sum of the elastic forces of a pair of first elastic members 310 opens the first valve port 102a. The greater the sum of the elastic forces of the first elastic members 310, the more capable it is to instantly open the first valve port 102a. That is, the magnitude of the elastic force of the first elastic members 310 is the key factor determining whether the first valve port 102a can be smoothly opened; within the range of 0% to 50% on the abscissa, the first valve port 102a opens first, and the second valve port 102b is simultaneously in the open state. The first valve port 102a, the second valve port 102b, and the inner cavity 101 of the valve body 100 are communicated. The pressure of the old high-pressure fluid in the first valve port 102a gradually decreases, and the new high-pressure fluid flows in from the bottom of the second piston 230. The high-pressure fluid and the fluid in the inner cavity 101 form a pressure difference. The fluid pressure formed by the pressure difference acts on the piston assembly 200. The fluid pressure and the sum of the elastic forces of a pair of first elastic members 310 push the piston assembly 200 to move to the position where the equilibrium state is located. The direction of the fluid pressure is the same as the direction of the sum of the elastic forces of a pair of first elastic members 310.

[0103] After that, within the range of 50% to 100% on the abscissa, the direction of the fluid pressure is opposite to the direction of the sum of the elastic forces of a pair of first elastic members 310. The piston assembly 200 needs to overcome the sum of the elastic forces of a pair of first elastic members 310 to move until the second valve port 102b is in the closed state. Therefore, the sum of the elastic forces of a pair of first elastic members 310 acts as both the driving force for opening the first valve port 102a and the resistance for closing the second valve port 102b. Since the maximum sum of the elastic forces of a pair of first elastic members 310 corresponding to curve 1, curve 2, and curve 3 are all equal, the present application analyzes the elastic force that the switching valve needs to overcome during switching.

[0104] From Figure 15 it can be seen that within the range of 50% to 100% on the abscissa, when the three curves have the same abscissa value, the resultant elastic force corresponding to curve 1 and the resultant elastic force corresponding to curve 2 are both smaller than the resultant elastic force corresponding to curve 3. From this, it can be known that when the switching valve is switched, the resistance that the flow resistance in curve 1 needs to overcome and the resistance that the flow resistance in curve 2 needs to overcome are both smaller than the resistance that the flow resistance in curve 3 needs to overcome.

[0105] Therefore, for the switching valve of the embodiment of the present application, since the free length L' of the first elastic member 310 satisfies: L2 < L' ≤ (L1 + L2) / 2, or L' ≥ L1, the resistance that needs to be overcome during valve switching becomes smaller, thereby effectively improving the operating ability of the valve.

[0106] Such as Figure 14As shown in the figure, the switching valve according to the embodiment of the present application further includes a pair of second elastic members 320 for keeping the piston assembly 200 in a balanced state.

[0107] In one embodiment, the second elastic member 320 is a compression spring and is sleeved on the outer periphery of the plug rod 210.

[0108] A pair of second elastic members 320 are respectively located on both sides of the partition portion 110 along the movement direction of the piston assembly 200; further, one ends of the pair of second elastic members 320 respectively abut against the guide sleeve 112, and the other ends respectively abut against the first piston 220 and the second piston 230; furthermore, the guide sleeve 112 has a first limiting surface 1121 and a second limiting surface 1122, and the first limiting surface 1121 and the second limiting surface 1122 are arranged back to back along the axial direction of the plug rod 210; one ends of the pair of second elastic members 320 respectively abut against the first limiting surface 1121 and the second limiting surface 1122. As an example, the first elastic member 310 is sleeved on the outer periphery of the second elastic member 320.

[0109] In one embodiment, one end of the first section 112a facing away from the second section 112b has a first limiting surface 1121, and one end of the second section 112b facing away from the first section 112a has a second limiting surface 1122.

[0110] Wherein, when the piston assembly 200 blocks one of the first valve port 102a and the second valve port 102b, the second elastic force provided by the second elastic member 320 to the piston assembly 200 is greater than the first elastic force provided by the first elastic member 310 to the piston assembly 200.

[0111] As an example, when the piston assembly 200 blocks one of the first valve port 102a and the second valve port 102b, the lengths of the pair of second elastic members 320 are L3 and L4 respectively, L3 is greater than L4, the free length of the second elastic member 320 is L”, L4 < L” < (L3 + L4) / 2, and L’ ≥ L1. Wherein, L” can be less than L’.

[0112] It should be noted that, as Figure 15 shown in the figure, there is a stroke with zero elastic resultant force in the curve 2 (L2 < L’ ≤ (L1 + L2) / 2) (for example, 40% - 60% of the abscissa). In this interval, it is easy to have problems such as the piston assembly 200 being unstable and shaking up and down due to the zero elastic resultant force, resulting in noise and vibration. When L’ ≥ L1, the piston assembly 200 is always in contact with the pair of second elastic members 320, and the pair of second elastic members 320 support the piston assembly 200, and the piston assembly 200 operates stably throughout the process without shaking.

[0113] In addition, Figure 15At the same abscissa, the elastic resultant force corresponding to Curve 1 is greater than the elastic resultant force corresponding to Curve 2. This will cause the piston assembly 200 to be subjected to a relatively large elastic force throughout the entire movement process, which is not conducive to improving the actuation ability.

[0114] Based on this, the switching valve according to the embodiment of the present application is provided with a pair of first elastic members 310 and a pair of second elastic members 320. The free length of the first elastic member 310 is designed to be L’≥L1, and the free length of the second elastic member 320 is designed to be L4<L”<(L3 + L4) / 2. The elastic resultant forces of the pair of first elastic members 310 and the pair of second elastic members 320 respectively form two curves throughout the entire movement stroke of the piston assembly 200. After the two curves are coupled, they form as Figure 16 the curve shown. Figure 16 In [Figure], the maximum elastic resultant force received by the piston assembly 200 throughout the entire movement stroke is equal to Figure 4 the maximum elastic force received by the piston assembly 200 shown in [Figure] throughout the entire movement stroke. And when the piston assembly blocks one of the first valve port and the second valve port, the second elastic force provided by the second elastic member to the piston assembly is greater than the first elastic force provided by the first elastic member to the piston assembly, so that the piston assembly 200 moves towards the position where the equilibrium state is located under the action of the relatively large second elastic force. That is, the second elastic member with a relatively large elastic force effectively improves the actuation ability of the valve, and the elastic force of the relatively large second elastic member can smoothly open the first valve port 102a.

[0115] It can be seen from Figure 16 that within the interval of the abscissa from 10% to 90%, only the elastic resultant force provided by the pair of first elastic members 310 acts on the piston assembly 200, and this elastic resultant force is relatively small. The resistance to be overcome during valve switching becomes smaller, thereby effectively improving the actuation ability of the valve; in addition, L’≥L1, and the pair of first elastic members can play a role in stabilizing the piston assembly, preventing the piston assembly 200 from generating noise and vibration.

[0116] Thus, it can be seen that the switching valve according to the embodiment of the present application can take into account the problems of improving the actuation ability of the valve and preventing the piston assembly 200 from generating noise and vibration.

[0117] It can be understood that the design of this embodiment can be applied to the switching valves of any of the above embodiments, and will not be listed one by one here.

[0118]

Embodiment Seven

[0119] As shown in Figure 17 and Figure 18 [Figure], the same parts of the seventh embodiment of the present application and the above embodiments will not be elaborated again. The differences are as follows:

[0120] The switching valve according to an embodiment of the present application includes a valve body 100, a piston assembly 200, and an elastic member. The elastic member includes a pair of first elastic members 310. The valve body 100 has an inner cavity 101, and the inner cavity 101 has a first channel 102 and a second channel 103; the piston assembly 200 is movably disposed in the inner cavity 101 for blocking the first channel 102 and / or the second channel 103; wherein, the first channel 102 and the second channel 103 are arranged along the movement direction of the piston assembly 200. The elastic member is used to keep the piston assembly 200 in a balanced state. When the piston assembly 200 is in a balanced state, the piston assembly 200 blocks both the first channel 102 and the second channel 103 at the same time.

[0121] In the switching valve according to an embodiment of the present application, when the piston assembly 200 is in a balanced state, both the first channel 102 and the second channel 103 are in a closed state. At this time, the fluid driving force applied to the piston assembly 200 due to throttling when the fluid passes through the switching valve is the largest. Therefore, the operating ability of the switching valve is maximally improved, and the reliability of the operation of the switching valve is enhanced. For example, the piston assembly can be switched from a state where the first channel 102 is blocked and the second channel 103 is open to a state where the second channel 103 is blocked and the first channel 102 is open. Among them, during the process of switching from the state where the first channel 102 is blocked and the second channel 103 is open to the state where the first channel 102 is blocked and the second channel 103 is blocked, the force driving the piston assembly 200 to move is the elastic member and the fluid force. When switching from the state where the first channel 102 is blocked and the second channel 103 is blocked to the state where the second channel 103 is blocked and the first channel 102 is open, it is necessary to overcome the elastic force of the elastic member. At this time, throttling occurs due to the blocking of the second channel 103, and the fluid driving force generated due to throttling can just overcome the elastic force of the elastic member. In an embodiment, the elastic member includes a pair of first elastic members 310. For the convenience of description, the pair of first elastic members 310 are respectively defined as a first elastic part and a second elastic part. The pair of first elastic members 310 can ensure the stability of the piston assembly 200 in a balanced state. In addition, the first elastic part is used to provide a first elastic force for the piston assembly 200 to move towards the position blocking the second channel 103; the second elastic part is used to provide a second elastic force for the piston assembly 200 to move towards the position blocking the first channel 102.

[0122] As Figure 18 shown, a partition part 110 is provided in the inner cavity 101. The partition part 110 divides the inner cavity 101 into a first channel 102 and a second channel 103; the first elastic part is located in the first channel 102, and the second elastic part is located in the second channel 103.

[0123] The piston assembly 200 includes a piston rod 210, a first piston 220, and a second piston 230. The first piston 220 is connected to an axial end of the piston rod 210 and is used to block the first passage 102. One end of the first elastic part abuts against the partition part 110, and the other end abuts against the first piston 220; the second piston 230 is connected to the other axial end of the piston rod 210 and is used to block the second passage 103. One end of the second elastic part abuts against the partition part 110, and the other end abuts against the second piston 230.

[0124] In the embodiment of the present application, one end of the first elastic part abuts against the partition part 110, and the other end abuts against the first piston 220. The first elastic force provided by the first elastic part is used to make the first piston 220 tend to open the first passage 102; one end of the second elastic part abuts against the partition part 110, and the other end abuts against the second piston 230. The second elastic force provided by the second elastic part is used to make the second piston 230 tend to open the second passage 103.

[0125] In one embodiment, the first elastic part and the second elastic part can be compression springs and are sleeved on the outer periphery of the piston rod 210.

[0126] The first piston 220 includes a first body 221 and a first sealing ring 222. The first body 221 is connected to an axial end of the piston rod 210. The first sealing ring 222 is sleeved on the outer periphery of the first body 221 and is used for sealing cooperation with the first passage 102. Among them, the first body 221 and the piston rod 210 can be connected by means such as screwing, interference fit, welding, etc.

[0127] The second piston 230 includes a second body 231 and a second sealing ring 232. The second body 231 is connected to the other axial end of the piston rod 210. The second sealing ring 232 is sleeved on the outer periphery of the second body 231 and is used for sealing cooperation with the second passage 103. Among them, the second body 231 and the piston rod 210 can be connected by means such as screwing, interference fit, welding, etc.

[0128] The partition part 110 includes a partition ring 111 and a guide sleeve 112. The partition ring 111 is fixedly connected to the wall of the inner cavity 101 and is circumferentially connected to the outer periphery of the guide sleeve 112. The piston rod 210 is movably inserted into the guide sleeve 112.

[0129] In the embodiment of the present application, the piston rod 210 is in guiding cooperation with the guide sleeve 112, which improves the stability of the movement of the piston rod 210 and further improves the reliability of the valve action.

[0130] As Figure 18As shown, the axial two ends of the guide sleeve 112 have a first limiting surface 1121 and a second limiting surface 1122, and the first limiting surface 1121 and the second limiting surface 1122 are arranged away from each other along the movement direction of the piston assembly 200. The first limiting surface 1121 is configured to abut against the first piston 220 of the piston assembly 200 when the piston assembly 200 seals the first channel 102 and moves to the first extreme position, and the second limiting surface 1122 is configured to abut against the second piston 230 of the piston assembly 200 when the piston assembly 200 seals the second channel 103 and moves to the second extreme position. In other words, when the piston assembly 200 is in the first extreme position, the first limiting surface 1121 abuts against the first piston 220, and the second channel 103 is in the maximum open state; when the piston assembly 200 is in the second extreme position, the second limiting surface 1122 abuts against the second piston 230, and the first channel 102 is in the maximum open state.

[0131] In the embodiment of the present application, by providing the first limiting surface 1121 and the second limiting surface 1122, the piston assembly 200 can be limited when it is in the first extreme position and the second extreme position.

[0132] As Figure 18 shown, the separating ring 111 has a first ring surface 1111 and a second ring surface 1112, and the first ring surface 1111 and the second ring surface 1112 are arranged away from each other along the movement direction of the piston assembly 200; the part of the guide sleeve 112 extending out of the first ring surface 1111 is defined as the first section 112a, and the first elastic part is sleeved on the outer periphery of the first section 112a; the part of the guide sleeve 112 extending out of the second ring surface 1112 is defined as the second section 112b, and the second elastic part is sleeved on the outer periphery of the second section 112b.

[0133] On the other hand, the present application also provides a refrigeration system, including the switching valve of any one of the above. Since it includes the switching valve of any one of the above embodiments, the refrigeration system of the embodiment of the present application includes all the advantages and beneficial effects of any one of the above embodiments, which will not be elaborated here.

[0134] In summary, the switching valve and the refrigeration system of the embodiment of the present application at least have the following advantages and beneficial effects:

[0135] In the switching valve according to the embodiment of the present application, when the piston assembly is in a balanced state, both the first channel and the second channel are in a closed state, and the gap between the piston assembly and the inner wall of the valve body is zero; when fluid flows into the first channel, the maximum throttling effect can be generated due to the first channel being blocked by the piston assembly, and the fluid driving force generated by throttling is the largest. The fluid driving force pushes the piston assembly to open the second channel; or, when fluid flows into the second channel, the maximum throttling effect can be generated due to the second channel being blocked by the piston assembly, and the fluid driving force generated by throttling is the largest. The fluid driving force can push the piston assembly to open the first channel; therefore, the action ability of the switching valve is maximally improved, and the reliability of the action of the switching valve is enhanced.

[0136] It can be understood that the various embodiments / implementations provided in the present application can be combined with each other without conflict, and no further examples will be given here.

[0137] In the embodiments of the application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the application can be understood according to specific circumstances.

[0138] In the description of the embodiments of the application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the application and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the embodiments of the application.

[0139] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0140] The above are only the preferred embodiments of the application examples and are not used to limit the application examples. For those skilled in the art, there can be various changes and modifications to the application examples. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application examples shall be included within the protection scope of the application examples.

Claims

1. A switching valve, characterized in that: include: A valve body having an inner cavity, wherein the inner cavity has a first channel and a second channel; a piston assembly, movably disposed in the inner cavity, for blocking the first channel and / or the second channel; An elastic member, used to keep the piston assembly in a balanced state; the balanced state means that the piston assembly remains stationary relative to the valve body in the absence of fluid impact; Wherein, when the piston assembly is in the balanced state, the piston assembly blocks the first channel and the second channel simultaneously.

2. The switching valve according to claim 1, characterized in that: A partition is provided in the inner cavity, and the partition divides the inner cavity into the first channel and the second channel; The elastic member includes a first elastic portion and a second elastic portion; The first elastic part is located in the first channel, and one end of the first elastic part abuts against the partition part, and the other end abuts against one end of the piston assembly; the second elastic part is located in the second channel, and one end of the second elastic part abuts against the partition part, and the other end abuts against the other end of the piston assembly; the first elastic part and the second elastic part are used to keep the piston assembly in a balanced state.

3. The switching valve according to claim 2, characterized in that: The partition has a guide hole, and the guide hole penetrates the partition along the moving direction of the piston assembly; the piston assembly is movably arranged in the guide hole.

4. The switching valve according to claim 3, characterized in that: The partition part comprises a partition ring and a guide sleeve. The partition ring is fixedly connected to the cavity wall of the inner cavity and is connected to the outer circumference of the guide sleeve. The guide sleeve has the guide hole.

5. The switching valve according to claim 4, characterized in that: The guide sleeve has a first limiting surface and a second limiting surface at two axial ends, and the first limiting surface and the second limiting surface are arranged opposite to each other along the moving direction of the piston assembly; The first limiting surface is configured to abut against the piston assembly when the piston assembly blocks the first channel and moves to a first limit position, and the second limiting surface is configured to abut against the piston assembly when the piston assembly blocks the second channel and moves to a second limit position.

6. The switching valve according to claim 4, characterized in that: The separation ring has a first ring surface and a second ring surface, and the first ring surface and the second ring surface are arranged opposite to each other along the movement direction of the piston assembly; The portion of the guide sleeve extending out of the first annular surface is defined as a first section, and the first elastic portion is sleeved on the outer circumference of the first section; the portion of the guide sleeve extending out of the second annular surface is defined as a second section, and the second elastic portion is sleeved on the outer circumference of the second section.

7. The switching valve according to claim 2, characterized in that: The piston assembly comprises: A plug rod movably inserted into the partition; a first piston connected to one axial end of the plug rod and used to block the first channel, the other end of the first elastic portion abutting against the first piston; and The second piston is connected to the other axial end of the plug rod and is used to block the second channel. The other end of the second elastic part abuts against the second piston.

8. The switching valve according to claim 7, characterized in that: The first elastic part and the second elastic part are sleeved on the outer circumference of the plug rod.

9. The switching valve according to claim 7, characterized in that: The first piston comprises a first body and a first sealing ring, the first body is connected to one axial end of the plug rod, and the first sealing ring is sleeved on the outer circumference of the first body and is used for sealing with the first channel; The second piston comprises a second body and a second sealing ring. The second body is connected to the other axial end of the plug rod. The second sealing ring is sleeved on the outer circumference of the second body and is used for sealingly cooperating with the second channel.

10. A refrigeration system, characterized in that: The invention comprises the switching valve as described in any one of claims 1 to 9.

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