A throttle valve

Abstract

The application discloses a throttle valve, which comprises a shell and a valve seat arranged in the shell, interfaces are arranged on two sides of the shell, a through-flow valve port is arranged on the valve seat, a valve core is arranged on the through-flow valve port and is capable of being displaced relative to the through-flow valve port so as to adjust the opening degree of the through-flow valve port, a valve core guide sleeve is arranged on the valve seat of the outer periphery of the through-flow valve port, the valve core is provided with a guide section which forms a sliding fit pair with the inner wall of the valve core guide sleeve, an accommodating cavity is formed between the valve port of the valve core and the valve core guide sleeve, and a flow hole is arranged on the side wall of the valve core guide sleeve and is communicated with the accommodating cavity and the inner cavity of the shell; an elastic member is arranged between the valve core and the valve core guide sleeve, and is configured to be deformed when the valve core is driven away from the through-flow valve port by the pressure medium; and the elastic member can release the deformation energy and acts on the valve core to press against the through-flow valve port and keep the closed state. Through the structural optimization, the working vibration and noise can be reasonably controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and in particular to a throttle valve. Background Art

[0002] In air conditioning systems, a throttle valve is installed between the condenser and evaporator. It throttles and reduces pressure during system operation, regulating both flow and pressure. A throttle valve is typically a capillary tube assembly (throttling short tube) or an electronic expansion valve. Capillary tube assemblies (throttling short tubes) primarily rely on their own flow resistance to regulate flow, resulting in poor regulation. Electronic expansion valves, while effective at regulating flow, require an electronic control system, leading to higher costs.

[0003] Figure 11 The illustrated adaptive throttling device for an air conditioner can achieve adaptive throttling. The device consists of a pipeline 10, a housing 20, a valve body 30, and an elastic member 40. During cooling or heating operation, the refrigerant flows into the pipeline 10 from one inlet, passes through the first through-hole 201 of the housing 20, and pushes open the corresponding valve body 30. Simultaneously, the corresponding elastic member 40 is compressed, causing the refrigerant to flow out of the side of the valve body 30 and into the other side. The channel in which the second through-hole 202 of the housing 20 is located is closed. During operation, the opening and closing of the refrigerant are controlled by a pressure differential, and the refrigerant can flow in both directions and vice versa.

[0004] When the above-mentioned adaptive throttling device is in operation, the refrigerant medium flows through the elastic member, which may easily interfere with the elastic member, causing vibration, noise and other adverse phenomena. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a throttle valve which reasonably controls working vibration and noise through structural optimization.

[0006] The throttle valve provided by the present invention includes a shell and a valve seat built into the shell, and interfaces are provided on both sides of the shell. The valve seat includes a flow valve port and a valve core, which is adapted to the flow valve port and can be displaced relative to the flow valve port to adjust the opening of the throttle valve; it also includes a valve core guide sleeve, which is integrally formed with or fixedly connected to the valve seat, the valve core has a guide section that forms a sliding fit pair with the inner wall of the valve core guide sleeve, and the valve port adapting section of the valve core is located on one side of the guide section, an accommodating cavity is formed between the valve port adapting section and the valve core guide sleeve, and a flow hole connecting the accommodating cavity and the inner cavity of the shell is provided on the side wall of the valve core guide sleeve; an elastic member is provided in the buffer cavity formed between the other side of the guide section and the valve core guide sleeve, and is configured so that: when the valve core moves away from the flow valve port under the action of a pressure medium, the elastic member is deformed; and the elastic member can release deformation energy to act on the valve core to press against the flow valve port.

[0007] Compared with the background technology, the present invention has a valve core guide sleeve sealed on the valve seat on the outer periphery of the flow valve port, and the valve core has a sliding fit pair with the inner wall of the valve core guide sleeve through the guide section, and the elastic part used to establish valve core balance with the flow medium pressure is placed between the valve core and the valve core guide sleeve on the other side of the guide section; an accommodating cavity is formed between the valve port adapter section and the valve core guide sleeve on one side of the guide section, and a flow hole connecting the accommodating cavity and the inner cavity of the shell is provided on the side wall of the valve core guide sleeve; after opening, the medium flowing through the flow valve port flows out of the throttle valve through the accommodating cavity, the flow hole and the inner cavity of the shell in turn. Based on the setting of the sliding fit pair, the phenomenon of direct impact of the medium on the elastic part can be reduced, thereby reducing the adverse effects caused by the medium flowing through the elastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the overall structure of the two-way throttle valve described in Example 1;

[0009] Figure 2 for Figure 1 Schematic diagram of an axial cross section of a two-way throttle valve shown in ;

[0010] Figure 3 for Figure 1 A schematic diagram of a two-way throttle valve in use is shown in FIG;

[0011] Figure 4 for Figure 1 Schematic diagram of another use state of the two-way throttle valve shown in;

[0012] Figure 5 This is a schematic diagram of the overall structure of the one-way throttle valve described in Example 2;

[0013] Figure 6 for Figure 5 Schematic diagram of the one-way throttle valve in use;

[0014] Figure 7 for Figure 5 Schematic diagram of an axial cross section of a one-way throttle valve shown in ;

[0015] Figure 8 for Figure 5 Schematic diagram of the valve core body shown in;

[0016] Figure 9 for Figure 5 Schematic diagram of the damping body shown in;

[0017] Figure 10 for Figure 5 Schematic diagram of the transition body shown in;

[0018] Figure 11 This is a schematic diagram of a typical throttle valve described in the background art.

[0019] Figure 1 - Figure 10 middle:

[0020] Shell 1, interface 11, valve seat 2, flow valve port 21, annular groove 22, valve core 3, valve port adapter section 31, guide section 32, guide groove 321, set protrusion 33, valve core body 34, installation inner cavity 341, radial hole 342, damping groove 343, small diameter hole 344, damping adapter 35, damping body 351, damping hole 3511, small diameter section 3512, transition body 352, transition flow channel 3521, set protrusion 3522, valve core guide sleeve 4, flow hole 41, limit block 42, set protrusion 421, limit portion 422, axial limit step 43, covering section 44, elastic member 5, guide ring 6, filter screen 7, mesh body 71, middle outer protrusion section 711, connecting cylindrical section 712, fixing ring 72, annular groove 721, damping ring 8.

[0021] Figure 11 middle:

[0022] Pipeline 10 , housing 20 , first through hole 201 , second through hole 202 , valve body 30 , elastic member 40 . DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] See Figure 1 and Figure 2 ,in, Figure 1 Schematic diagram of the overall structure of the two-way throttle valve according to this embodiment; Figure 2 for Figure 1 Schematic diagram of the axial section of the two-way throttle valve shown in .

[0026] The two-way throttle valve mainly comprises a housing 1 and a valve seat 2, a valve core 3, a valve core guide sleeve 4, and an elastic member 5 built into the housing 1. As shown in the figure, ports 11 are provided on both sides of the housing 1 for connecting to the system pipeline outside the valve to achieve the function of throttling and reducing pressure.

[0027] In this solution, two flow valve ports 21 are provided on the valve seat 2 built into the housing 1, which are respectively arranged toward the two sides of the valve seat 2; accordingly, the valve core 3, the valve core guide sleeve 4 and the elastic member 5 are all arranged corresponding to the corresponding side flow valve ports 21.

[0028] The valve core 3 that can be displaced relative to each flow valve port 21 is adapted to the corresponding flow valve port 21 to adjust its opening. When the valve port adapting section 31 at one end of the valve core 3 presses against the flow valve port 21, it is in the Figure 1 In the closed state shown in FIG. 1 , when the valve core 3 is separated from the flow valve port 21 under the action of the medium pressure, it is in the closed state. Figure 3 or Figure 4 Of course, based on the different distances of the valve core 3 relative to the flow valve port 21, different flow openings are constructed.

[0029] A valve core guide sleeve 4 is provided on the valve seat 2, located on the periphery of each flow-through valve port 21. The guide sleeve 4 and valve seat 2 can be integrally formed or separately machined and then fixedly connected. The valve core 3 includes a guide section 32 that forms a sliding fit with the inner wall of the valve core guide sleeve 4. Its valve port adaptor section 31 is located on the side of the guide section 32 proximal to the flow-through valve port 21. As shown in the figure, an accommodating chamber A is formed between the valve port adaptor section 31 and the valve core guide sleeve 4. Correspondingly, a flow hole 41 is provided on the side wall of the valve core guide sleeve 4, connecting the accommodating chamber A with the interior cavity of the housing 1. When pressure medium on one side of the valve seat 2 pushes the valve core 3 on the corresponding side out of the flow-through valve port 21, it first enters the corresponding accommodating chamber A through the flow-through valve port 21 and then flows through the flow hole 41 to the interior cavity of the housing 1 on the other side of the valve seat 2.

[0030] The elastic member 5, used to establish valve core balance with the flow medium pressure, is disposed in a buffer chamber B formed between the valve core 3 and the valve core guide sleeve 4 on the other side of the guide section 32. That is, the relatively fixed valve core guide sleeve 4 provides support for the stop end of the elastic member 5. The specific configuration is as follows: when each valve core 3 moves away from the corresponding flow valve port 21 under the action of the pressure medium, the elastic member 5 deforms, storing elastic deformation energy; and when the pressure decreases, based on the setting of the sliding fit pair, the elastic member 5 can release this deformation energy to act on the valve core 3, causing it to move toward the flow valve port 21. When the valve port adapter section 31 of the valve core 3 presses against the flow valve port 21, the valve core 3 can maintain a closed state.

[0031] In the above process, the medium flow path is located on one side of the guide section 32 of the valve core 3, and the elastic member 5 is located on the other side of the guide section 32 of the valve core 3. There is no direct contact between the medium and the elastic member 5, which can completely avoid the adverse effects caused by the medium flowing through the elastic member 5; at the same time, the sliding fit pair also has a guiding function for the displacement of the valve core 3, causing it to displace along the guide track, thereby reducing the circumferential shaking of the valve core 3.

[0032] The sliding guide function of the "sliding fit" can be implemented in various ways. For example, but not limited to, the structure shown in the figure comprises a guide groove 321 defined on the outer circumference of the guide section 32 of the valve core 3. A guide ring 6 is embedded in the guide groove 321 to form a sliding fit. Of course, in this embodiment, the guide ring 6 can also form a sealing fit with the guide sleeve 4. Specifically, the number of guide rings 6 can be selected based on different product design requirements, preferably spaced apart along the sliding displacement direction.

[0033] In practice, the guide ring 6 can also be configured in the reverse direction, with a guide groove (not shown) provided on the inner wall of the valve core guide sleeve 4 to embed the guide ring to form the sliding fit. Of course, the design of embedding the guide ring on the valve core 3 offers better manufacturability. It is understood that any design that can meet the functional requirements of the sliding fit described above is within the scope of protection claimed in this application.

[0034] In this solution, the valve guide sleeve 4, which fits the valve core 3, is cylindrical in shape, offering a simple structure and excellent manufacturability. Furthermore, the valve guide sleeve 4 can be provided with multiple flow holes 41 for medium circulation to meet actual flow requirements and enable rapid opening response. Here, the multiple flow holes 41 are evenly distributed along the circumference of the valve guide sleeve 4, preventing unbalanced loading of the valve core 3 during displacement.

[0035] Furthermore, along the displacement direction of the valve core 3, the edge of the flow hole 41 is flush with the end surface of the valve core guide sleeve 4. Please refer to Figure 2 With this arrangement, the flow distance of the pressure medium from the flow valve port 31 to the flow hole 41 is minimized. When the valve core 3 is opened, after the valve port adapter section 31 is separated from the flow valve port 31, the pressure medium flows out directly through the flow hole 41, and there will be no jamming of the valve core 3 due to medium flow delay.

[0036] To prevent impurities in the system from entering the valve body, this solution installs a filter screen 7 within the inner cavity of the housing 1 between the valve seat 2 and the interface 11. This effectively blocks impurities when the medium enters the housing 1 through the interface 11, preventing them from entering the valve body and causing malfunction or even jamming of the valve core 3.

[0037] Specifically, the filter 7 comprises a mesh 71 and a retaining ring 72. The mesh 71 is secured to the inner wall of the housing 1 via the retaining ring 72. The mesh 71 can be designed based on the required flow parameters to achieve good filtration while ensuring that the resulting flow resistance does not affect normal valve function. For example, but not limited to, a preferred exemplary embodiment is shown in the figure.

[0038] Please also see Figure 2The mesh body 71 comprises a central, outwardly convex section 711 and a connecting cylindrical section 712. The retaining ring 72 has an axially extending annular groove 721. The connecting cylindrical section 712 of the mesh body 71 is inserted and fixed within the annular groove 721, securing the mesh body. Furthermore, a flow clearance C is provided between the connecting cylindrical section 712 and the housing 1. This effectively increases the specific surface area of ​​the mesh body 1 involved in filtration, preventing localized impurity blockage that could affect the throttle valve's operation, extending its lifespan and further reducing system maintenance costs.

[0039] It should be noted that the elastic member 5 for establishing valve core balance with the flow medium pressure can adopt different structural forms, and preferably adopts the compression spring shown in the figure.

[0040] Furthermore, the stopper structure of the elastic member 5 during its deformation process, i.e., the end away from the corresponding flow-through valve port 21, can also be selected based on the product. In this embodiment, a built-in stopper 42 is provided at the end of the valve core guide sleeve 4 opposite the elastic member 5. The elastic member 5 is pre-compressed and deformed between the valve core 3 and this stopper 42, ensuring that the valve port maintains a well-sealed state under normal conditions.

[0041] In addition, for the compression spring (elastic part 5), the adapter end of the valve core 3 and the compression spring is provided with a set protrusion 33, and the adapter end of the limit block 42 and the compression spring is provided with a set protrusion 421; the set protrusion 33 and the set protrusion 421 are both formed along the axial extension of their respective bodies. After assembly is completed, a radial limit can be formed for the compression spring, reducing the phenomenon of lateral deviation during the operation process.

[0042] To achieve higher actuation stability, the limit block 42 needs to maintain a fixed relationship with the valve core guide sleeve 4. Preferably, an axial limit step 43 is provided on the inner wall of the valve core guide sleeve 4. Accordingly, the inner end surface of the limit block 42 has a radially extending limit portion 422. As shown in the figure, the limit portion 422 of the limit block 42 abuts and fits against the axial limit step 43 of the valve core guide sleeve 4. At the same time, a radially inwardly bent covering section 44 is provided on the end of the valve core guide sleeve 4 opposite the elastic member 5. Overall, this ensures reliable fixation of the limit block 42.

[0043] It should be understood that the stopper 42 that axially limits the stop end of the elastic member 5 can adopt a split-piece plug-in structure as shown in the figure, or it can be integrally formed with the valve core guide sleeve 4. In comparison, the use of separate processing and then radial riveting to form the end limit covering section 44 is more manufacturable.

[0044] To achieve better assembly processability, it is preferred that an annular groove 22 be formed on the outer peripheral surface of the valve seat 2, and the housing 1 at the corresponding position is fixed to the valve seat 2 by riveting through the annular groove 22. After riveting is completed, the housing 1 at the corresponding position is embedded in the annular groove 22, and the valve seat 2 is reliably fixed with high operability.

[0045] In addition, the mesh body 71 and the fixing ring 72 can also be fixed by a riveting process. Specifically, the fixing ring 72 can be formed with a ring groove 721 using sheet metal. After the connecting cylindrical section 712 of the mesh body 71 is inserted into the ring groove 721, it is fixed by riveting, which also has good assembly processability.

[0046] The working principle of the two-way throttle valve described in this embodiment is briefly described below.

[0047] When the air conditioner is cooling, if the refrigerant flows into the housing 1 from the left interface 11, passes through the filter 7, and enters the first flow valve port 21 (located at the bottom of the figure) of the valve seat 2, the corresponding valve core 3 is pushed. The valve core 3 moves to the right along the valve core guide sleeve 4 sealed with the valve seat 2. At the same time, the elastic member 5 is compressed and the sealing member 6 maintains the sealing effect. The refrigerant can only flow out from the flow hole 41. At this time, the second flow valve port 21 (located at the top of the figure) of the valve seat 2 is in a closed state. Figure 3 During heating, the refrigerant flows into the housing 10 from the right inlet, passes through the filter screen 7, and enters the second flow valve port 21 (located above the drawing) of the valve seat 2, pushing the valve core 3. The valve core 3 moves to the left along the valve core guide sleeve 4 sealed with the valve seat 2. At the same time, the elastic member 5 is compressed and the sealing member 6 maintains the sealing effect. The refrigerant can only flow out from the flow hole 41. At this time, the first flow valve port 21 (located below the drawing) of the valve seat 2 is in a closed state. Figure 4 .

[0048] It should be noted that this embodiment uses a throttle valve with a bidirectional throttling function as the main body for describing and explaining this solution in detail. The specific number of corresponding structures that implement the throttling function does not constitute a substantial limitation on the technical solution claimed in this application. It should be understood that the design concept of this valve body structure is also applicable to a one-way throttle valve. As long as the core concept is consistent with this solution, it is within the scope of protection claimed in this application.

[0049] Example 2:

[0050] Please also see Figure 5 、 Figure 6 and Figure 7 ,in, Figure 5 This is a schematic diagram of the overall structure of the one-way throttle valve described in this embodiment. Figure 6 for Figure 5 The schematic diagram of the one-way throttle valve in use is shown in the figure. Figure 7 for Figure 5Schematic diagram of the axial section of the one-way throttle valve shown in .

[0051] As shown in the figure, the one-way throttle valve provided in this embodiment shares the same core design concept as the first embodiment. This design reduces direct impact of the medium on the elastic member during operation, mitigates adverse effects of the medium flowing through the elastic member, and reduces unnecessary vibration and noise. To clearly illustrate the differences and connections between the two, identical functional components or structures are indicated with the same reference numerals in the figures.

[0052] The valve seat 2 of this one-way throttle valve is also built into the housing 1. It features a flow-through valve port 21, along with corresponding valve core 3, valve core guide sleeve 4, and elastic member 5. As shown, ports 11 are provided on both sides of the housing 1 to connect to external system piping for one-way throttling and pressure reduction.

[0053] The valve core 3 of this solution can be displaced relative to the flow valve port 21 to adjust its opening. When the valve port adapter section 31 at one end of the valve core 3 presses against the flow valve port 21, it is in the Figure 5 In the closed state shown in FIG. 1 , when the valve core 3 is separated from the flow valve port 21 under the action of the medium pressure, it is in the closed state. Figure 6 Of course, based on the different distances of the valve core relative to the through-flow valve port 21, different flow openings are constructed.

[0054] Similarly, a valve core guide sleeve 4 is provided on the valve seat 2 on the outer periphery of the flow valve port 21. The valve core 3 has a guide section 32 that forms a sliding fit with the inner wall of the valve core guide sleeve 4. The valve port adapting section 31 is located on the side of the guide section 32 that is close to the flow valve port 21. Figure 5 As shown, an accommodating chamber A is formed between the valve port adapting section 31 and the valve core guide sleeve 4, and a buffer chamber B is formed between the valve core 3 and the valve core guide sleeve 4 on the other side of the guide section 32.

[0055] Here, the valve seat 2 and the valve core guide sleeve 4 can be processed separately and then assembled, or they can be formed integrally. Specifically, a flow hole 41 is provided on the side wall of the valve core guide sleeve 4, connecting the accommodating chamber A and the inner cavity of the housing 1. When the pressure medium on one side of the valve seat 2 pushes the valve core 3 on the corresponding side away from the flow valve port 21, it first enters the corresponding accommodating chamber A through the flow valve port 21, and then flows through the flow hole 41 to the inner cavity of the housing 1 on the other side of the valve seat 2. The elastic member 5 is disposed in the buffer chamber B, and the relatively fixed valve core guide sleeve 4 also provides support for the stop end of the elastic member 5. When the valve core 3 moves away from the flow valve port 21 on the corresponding side under the action of the pressure medium, the elastic member 5 deforms. When the pressure decreases, the elastic member 5 acts on the valve core 3, causing it to move toward the flow valve port 21. When the valve port adapter section 31 of the valve core 3 presses against the flow valve port 21, the closed state is maintained.

[0056] In this embodiment, a damping ring 8 is nested within the outer circumference of the guide segment 32 to form a sliding fit. Specifically, the damping ring 8 is positioned within a damping groove 343 defined within the outer circumference of the guide segment 32. Preferably, the damping ring 8 can be cylindrical, as shown in the figure, to better control axial displacement and radial high-frequency vibration of the valve core 3, further reducing valve actuation noise and system resonance.

[0057] Specifically, according to different product design requirements, the number of the damping ring 8 can be selectively configured, such as but not limited to the one shown in the figure.

[0058] In this solution, the cylindrical valve core guide sleeve 4 is provided with multiple flow holes 41 for medium circulation to meet actual flow requirements and enable rapid opening response. The elastic member 5, used to balance the valve core with the pressure of the flowing medium, can also adopt different structural forms, preferably using the compression spring shown in the figure. The stop end of the elastic member 5 during its deformation process is axially limited by a limit block 42 built into the valve core guide sleeve 4 and threadedly connected to its inner wall. Furthermore, based on this threaded connection, the initial preload force of the elastic member 5 can be adjusted by rotating the limit block 42, thereby achieving different throttling and pressure reduction functions.

[0059] Furthermore, the valve core 3 of this solution has a damping hole 3511 that can connect the accommodating chamber A and the buffer chamber B, so that when the valve core 3 slides and displaces under the action of the pressure difference at both ends, medium flow damping is formed between the two chambers, thereby avoiding the actuation impact in the initial stage of the displacement of the valve core 3 and further reducing unnecessary vibration and noise.

[0060] In order to further reduce the process cost, the valve core 3 can preferably adopt a split design, including a valve core body 34 and a damping adapter 35. Figure 7 and Figure 8 ,in, Figure 8 for Figure 5 Schematic diagram of the valve core body shown in .

[0061] The valve port adapting section 31 and guide section 32 are formed on the valve core body 34. The guide section 32 has a mounting cavity 341, and the valve port adapting section 31 has a radial hole 342 that communicates with the mounting cavity 341. One end of the damping adapter 35 is inserted into the mounting cavity 341 of the valve core body 34, and the other end is adapted to the elastic member 5. The damping hole 3511 is formed on the damping adapter 35 and connects the accommodating chamber A and the buffer chamber B via the mounting cavity 341 and the radial hole 34. The split design greatly reduces the difficulty of drilling and perforating the damping hole 3511.

[0062] Furthermore, the damping adapter 35 may further include a damping body 351 and a transition body 352, please refer to Figure 7、 Figure 9 and Figure 10 ,in, Figure 9 for Figure 5 The schematic diagram of the damping body is shown in Figure 10 for Figure 5 Schematic diagram of the transition body shown in .

[0063] The damping body 351 is inserted in the installation inner cavity 341 of the valve core body 34, and the damping hole 3511 axially passing through the damping body 351 is connected with the radial hole 342 of the valve core body 34; the transition body 352 serves as a component for transmitting the force between the valve core 3 and the elastic member 5, one end of which is inserted in the installation inner cavity 341 of the valve core body 34 and axially abuts against the damping body 351; the other end of the transition body 352 is adapted to the elastic member 5, and of course, the transition body 352 has a transition flow channel 3521 connecting the damping hole 3511 and the buffer chamber B.

[0064] Specifically, a small-diameter hole 344 is disposed between the mounting cavity 341 and the radial hole 342 of the valve core body 34. The inner diameter of the small-diameter hole 344 is smaller than the inner diameter of the mounting cavity 341. Accordingly, the damper body 351 has a small-diameter section 3512 that fits snugly into the small-diameter hole 344. This allows for quick assembly and a high degree of overall product integration.

[0065] To ensure that the movable end of the elastic member 5 is reliably pressed against and adapted to the transition body 352, a fitted protrusion 3522 can also be provided on the adapted end of the transition body 352, thereby forming a radial limit for the elastic member 5 together with the fitted protrusion 421 on the limiting block 42. It is understood that, while still meeting the aforementioned functions, the transition channel 3521 can adopt various structural forms, as long as it satisfies the requirement of connecting the damping hole 3511 and the buffer chamber B.

[0066] The working principle of the one-way throttle valve described in this embodiment is briefly described below.

[0067] When the left refrigerant medium establishes working pressure, it flows into the shell 1 from the left interface 11, enters the flow valve port 21 of the valve seat 2 and pushes the valve core 3. The valve core 3 moves to the right along the valve core guide sleeve 4 sealed with the valve seat 2, and its valve port adapter section 31 disengages from the flow valve port 21. The refrigerant medium flows out from the flow hole 41, and at the same time the elastic member 5 is compressed; when the left refrigerant medium has no working pressure, the valve core 3 can move to the left under the action of the elastic member 5, and at the same time can act on the valve core 3 together with the pressure of the refrigerant medium on the right until its valve port adapter section 31 presses against the flow valve port 21 and is in a closed state.

[0068] During operation, the one-way throttle valve is opened and closed by pressure differential control, and the valve body opening can be automatically adjusted according to the pressure differential to throttle. In addition, when the pressure difference on both sides of the valve changes dynamically, the displacement of the valve core 3 is adjusted synchronously.

[0069] It should be noted that this embodiment uses a throttle valve with a one-way throttling function as the main body for describing and explaining this solution in detail. The specific number of corresponding structures that implement the throttling function does not constitute a substantial limitation on the technical solution claimed in this application. It should be understood that the design concept of the valve body structure is also applicable to a two-way throttle valve.

[0070] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Throttle valve, characterized in that, and a valve core, the valve core being adapted to fit the valve core and being displaceable relative to the valve core to adjust the opening of the throttle valve; and a valve core guide sleeve being integrally formed with or fixedly connected to the valve seat, the valve core having a guide section for forming a sliding fit with an inner wall of the valve core guide sleeve, and a valve port adapting section of the valve core being located on one side of the guide section, an accommodating cavity being formed between the valve port adapting section and the valve core guide sleeve, a flow hole connecting the accommodating cavity and the inner cavity of the housing being provided on the side wall of the valve core guide sleeve; an elastic member being provided in a buffer cavity formed between the other side of the guide section and the valve core guide sleeve, and being configured such that: when the valve core moves away from the flow valve port under the action of a pressure medium, the elastic member is deformed; and the elastic member can release deformation energy to act on the valve core to press against the flow valve port; The valve seat is provided with two flow-through valve ports, which are respectively arranged toward two sides of the valve seat; correspondingly, the valve core, the valve core guide sleeve and the elastic member are all arranged corresponding to the flow-through valve ports on the corresponding sides.

2. The throttle valve according to claim 1, characterized in that A guide ring is provided between the outer peripheral surface of the guide section and the inner wall of the valve core guide sleeve to form the sliding fitting pair.

3. The throttle valve according to claim 1, characterized in that A damping ring is nested on the outer circumferential surface of the guide segment to form the sliding fit pair.

4. The throttle valve according to claim 1 or 2, characterized in that: The valve core guide sleeve is cylindrical, and one end of the valve core guide sleeve opposite to the elastic member is provided with a built-in limit block, and the elastic member is pre-compressed and deformed and arranged between the valve core and the limit block.

5. The throttle valve according to claim 4, characterized in that The elastic member is a compression spring, and the ends of the valve core and the limiting block that are adapted to the compression spring are respectively provided with a set protrusion that extends axially.

6. The throttle valve according to claim 5, characterized in that The inner wall of the valve core guide sleeve has an axial limit step, and the inner end face of the limit block has a limit portion formed by radial extension; the limit portion is adapted to abut against the axial limit step, and the end of the valve core guide sleeve opposite to the elastic member has a radially inwardly bent covering section to fix the limit block.

7. The throttle valve according to claim 5, characterized in that The limit block built into the valve core guide sleeve is threadedly connected to the inner wall thereof.

8. The throttle valve according to claim 4, characterized in that The valve core is provided with a damping hole which can communicate with the accommodating cavity and the buffer cavity.

9. The throttle valve according to claim 8, characterized in that The valve core includes a valve core body and a damping adapter, the valve port adapter section and the guide section are formed on the valve core body, and the guide section has an installation inner cavity, and the valve port adapter section has a radial hole connected to the installation inner cavity; one end of the damping adapter is inserted into the installation inner cavity of the valve core body, and the other end is adapted to the elastic member; the damping hole is formed on the damping adapter, and the damping hole is connected to the damping hole of the accommodating cavity and the buffer cavity through the installation inner cavity and the radial hole.

10. The throttle valve according to claim 9, characterized in that The damping adapter includes a damping body and a transition body. The damping body is inserted in the installation inner cavity of the valve core body, and the damping hole axially passing through the damping body is connected with the radial hole; one end of the transition body is inserted in the installation inner cavity and axially abuts against the damping body, the elastic member is adapted to the other end of the transition body, and the transition body has a transition flow channel connecting the damping hole and the buffer cavity.

11. The throttle valve according to claim 1, characterized in that The outer peripheral surface of the valve seat is provided with an annular groove, and the housing at the corresponding position is fixed to the valve seat by riveting through the annular groove.

12. The throttle valve according to claim 11, characterized in that The flow holes are arranged in a plurality and are evenly distributed in the circumferential direction; along the displacement direction of the valve core, the hole edges of the flow holes are flush with the end surface of the valve core guide sleeve.

13. The throttle valve according to claim 1, characterized in that A filter screen is provided in the inner cavity of the shell between the valve seat and the interface.

14. The throttle valve according to claim 13, characterized in that The filter screen includes a mesh body and a fixed ring, the mesh body has a central outward convex section and a connecting cylindrical section; the fixed ring is fixedly connected to the inner wall of the shell and has an axially opened annular groove, the barrel edge of the connecting cylindrical section is inserted into the annular groove, and a flow gap is provided between the connecting cylindrical section and the shell.

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