A control valve

Abstract

The control valve comprises a valve body part, a power part, a first valve core part and a second valve core part, the first valve core part comprises a first valve core, the second valve core part comprises a second valve core, the valve body part has a first cavity and a second cavity; the valve body comprises a first mounting connecting surface and a second mounting connecting surface, the first cavity extends to the first mounting connecting surface to form a first port, the second cavity extends to the second mounting connecting surface to form a second port, along the longitudinal direction of the control valve, the power part is located at the upper part of the valve body part, the center position of the first port is closer to the upper end of the valve body part than the center position of the second port, and the control valve can improve the opening / closing valve performance of the second valve core.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fluid control, in particular to a control valve. BACKGROUND

[0002] In vehicle or household air conditioning systems, evaporators, condensers, compressors and throttling components are needed. Generally, a throttling component is arranged before the evaporator in a refrigeration system, and the flow direction of the throttling component is fixed. Sometimes, to meet the needs of different modes of the system, the flow direction of the refrigerant in the system needs to be set to reverse flow, at which time a valve and a pipe component need to be additionally arranged to make the pipe connection in the system more and to increase the number of components. As a solution, a direction flow control function is integrated in the throttling component, but due to the small structure of the throttling component, a direction control flow channel needs to be additionally arranged in the throttling component, and the stability of the product function needs to be considered. SUMMARY

[0003] The control valve provided by the present application comprises a valve body component, a power component and a first valve core component, the first valve core component comprises a first valve core, the valve body component comprises a first valve port part, the first valve port part has a first valve port, the valve body component has a first cavity and a second cavity, and the power component can drive the first valve core to displace relative to the first valve port part, and the first valve port can communicate the first cavity with the second cavity.

[0004] The control valve further comprises a second valve core component, the second valve core component comprises a second valve core, the valve body component further comprises a second valve port part, the second valve port part is matched with the second valve core, the second valve port part has a second valve port, the second valve port is closed when the fluid medium flows from the first cavity to the second cavity, and the second valve port is opened when the fluid medium flows from the second cavity to the first cavity; the valve body component comprises a first mounting connecting surface and a second mounting connecting surface, the first cavity extends to the first mounting connecting surface to form a first port, and the second cavity extends to the second mounting connecting surface to form a second port; along the longitudinal direction of the control valve, the power component is located at the upper segment of the valve body component, and the center position of the first port is closer to the upper end of the valve body component than the center position of the second port.

[0005] The control valve provided by the present application can improve the opening / closing valve performance of the second valve core by relatively setting the center positions of the first port and the second port. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 The figure is a schematic diagram of the overall structure of the control valve provided by the present application.

[0007] Figure 2 : Figure 1Cross-sectional view in the X direction;

[0008] Figure 3 : Figure 1 Cross-sectional view in the Y direction;

[0009] Figure 4 : Figure 3 Enlarged view of the K region;

[0010] Figure 5 : Figure 2 Enlarged view of the H region;

[0011] Figure 6 : Distinction from Figure 4 Background art.

[0012] Figure 1-5 Explanation of reference numerals:

[0013] 10 - Control valve / thermostatic expansion valve;

[0014] 100 - Valve body member;

[0015] 110 - Valve body;

[0016] 111 - Upper housing cavity, 112 - Lower housing cavity, 113 - Center hole;

[0017] 120 - First valve port portion; 121 - First valve port;

[0018] 130 - Second valve port portion; 131 - Second valve port;

[0019] 140 - First cavity;

[0020] 141 - First port;

[0021] 150 - Second cavity;

[0022] 151 Second port;

[0023] 160 - Third cavity;

[0024] 170 - Temperature sensing cavity;

[0025] 171 - Third port, 172 - Fourth port;

[0026] 181 - First mounting surface, 182 - Second mounting surface, 183 - Third mounting surface;

[0027] 190 - Connection seat body;

[0028] 191 - Abutting surface, 192 - Support member;

[0029] 200 - Power member;

[0030] 300 - first spool part

[0031] 310 - first spool / valve stem

[0032] 311 - first fluid force surface, 312 - second fluid force surface

[0033] 400 - second spool part

[0034] 410 - second spool / diaphragm, 411 - body part

[0035] 420 - elastic member / compression spring

[0036] 500 - transmission rod

[0037] 600 - balance support part

[0038] 610 - spring, 620 - support seat

[0039] 810 - flow path inlet cavity, 820 - flow path outlet cavity

[0040] 830 - throttle valve port, 840 - one-way valve port DETAILED DESCRIPTION

[0041] In order to make the technical solution of the present application better understood by those skilled in the art, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings from these drawings without any creative effort. The up and down orientation words involved herein are defined by the positions of the parts shown in the drawings relative to each other, and are only for the purpose of expressing the clarity and convenience of the technical solution, and it should be understood that the orientation words used herein should not limit the scope of the present application; it should also be understood that the connection, fixation, abutment and other structural relationships described herein should include direct and indirect methods, unless otherwise specified to embody the inventive idea.

[0042] Figure 1 a whole structure diagram of a control valve according to the present application, Figure 2 is Figure 1 a sectional view of the X section, Figure 3 is Figure 1 a sectional view of the Y section.

[0043] As Figure 1 , Figure 2 and Figure 3The control valve is shown in FIG. 1. In this embodiment, the control valve is a thermal expansion valve. The thermal expansion valve 10 includes a valve body component 100. In this embodiment, the valve body 110 of the valve body component 100 is integrally formed by molding.

[0044] A first mounting surface 181, a second mounting surface 182, and a third mounting surface 183 are formed on the side of the valve body 110. The mounting surfaces are substantially perpendicular to each other. Since the valve body 110 is integrally formed by molding, the mounting surfaces are easy to manufacture.

[0045] An upper receiving cavity 111 is formed on the upper end of the valve body 110 in the longitudinal direction. The side wall of the upper receiving cavity 111 has mounting threads. A power component 200 is mounted and fixed to the valve body 110 by the mounting threads. The power component 200 includes a diaphragm box. When the pressure of the medium in the diaphragm box changes, the diaphragm will move in the longitudinal direction. A lower receiving cavity 112 is formed on the lower end of the valve body 110 in the longitudinal direction. The side wall of the lower receiving cavity 112 has mounting threads. A balance support component 600 is mounted and fixed to the valve body 110 by the mounting threads. The valve body 110 further includes a central hole 113 which extends through the upper receiving cavity 111 and the lower receiving cavity 112.

[0046] The control valve further includes a first cavity 140 in the shape of a circular hole and a second cavity 150 in the shape of a circular hole. The central axis of the first cavity 140 is substantially perpendicular to the first mounting surface 181. The first cavity 140 extends towards the first mounting surface 181 to form a first port 141. Similarly, the central axis of the second cavity 150 is substantially perpendicular to the second mounting surface 182. The second cavity 150 extends towards the second mounting surface 182 to form a second port 151. The central hole 113 extends through the first cavity 140 and the second cavity 150.

[0047] The first valve core component 300 includes a valve stem 310 as a first valve core. The lower end of the valve stem 310 abuts against the valve seat 620 of the balance support component 600 through a spring 610. A transmission rod 500 is arranged in the central hole 113. The upper end of the transmission rod 500 abuts against the diaphragm of the power component 200. The lower end of the transmission rod 500 abuts against the valve stem 310. In this way, the valve stem 310 is subjected to the pressure of the diaphragm and the pressure of the spring 610, and is in dynamic force balance in the longitudinal direction. When the pressure of the medium in the air tank of the power component 200 changes, the diaphragm will transmit the pressure change to the valve stem, and the valve stem 310 will move in the longitudinal direction to reach a new balance.

[0048] The valve body 110 further comprises a temperature sensing cavity 170, which is arranged longitudinally close to the diaphragm and communicates with the accommodating cavity 111 through the central hole 113. The temperature sensing cavity 170 extends to the first mounting connecting surface 181 to form a third port 171, and extends to the second mounting connecting surface 182 to form a fourth port 172. The medium of the system passes through the temperature sensing cavity 170, which can transmit pressure to the diaphragm, and the diaphragm transmits the pressure change to the valve stem, and a new balance is achieved through the longitudinal movement of the valve stem 310.

[0049] A first valve port 121 is formed between the first cavity 140 and the second cavity 150. The valve stem 310 is specially shaped at the position of the first valve port 121, and the flow area of the first valve port is changed by the longitudinal displacement of the valve stem 310 relative to the first valve port portion 120 of the first valve port 121, so as to achieve the purpose of controlling the throttling function of the valve.

[0050] The valve body 110 further comprises a third cavity 160, which faces the third mounting connecting surface 183, and the connecting seat body 190 is mounted in the third cavity 160 by screw connection.

[0051] The second valve core component 400 comprises a diaphragm 410 as a second valve core. The valve body 110 comprises a second valve port portion 130, the connecting seat body 190 comprises an abutting surface 191, the diaphragm 410 is located between the second valve port portion 130 and the abutting surface 191, and a compression spring 420 as an elastic member is arranged between the abutting surface 191 and the core portion 411 of the diaphragm 410, i.e. the compression spring 420 is located on the side of the diaphragm 410 opposite to the second valve port portion 130. The connecting seat body 190 is a cylindrical structure, comprising a support portion 192 capable of supporting the diaphragm 410 (in Figure 4 In this specific embodiment, the support portion 192 is three support rods fixed to the abutting surface 191 of the connecting seat body 190, which are arranged in a ring shape to define the movement space of the diaphragm 410.

[0052] The second valve port portion 130 is adapted to the diaphragm 410. When the fluid medium in the control valve 10 flows from the first cavity 140 to the second cavity 150, the diaphragm 410 abuts against the second valve port portion 130 to close the second valve port 131, and the first valve port 121 plays a throttling role, so that the control valve 10 acts as a throttling valve; when the fluid medium in the control valve 10 flows from the second cavity 150 to the first cavity 140, the diaphragm 410 is away from the second valve port portion 130 under the action of fluid pressure, the second valve port 131 is opened, and the control valve 10 is a normally open valve.

[0053] Figure 4 For Figure 3 the enlarged schematic view of the middle K region, Figure 5 the enlarged schematic view of the middle H region, Figure 2 the enlarged schematic view of the middle H region.

[0054] As shown in Figure 4 and Figure 5 In the above embodiment, along the longitudinal direction of the control valve 10, the power component 200 is installed on the upper part of the valve body component 100 (usually, the installation state of the control valve 10 is the front in the drawing). The center position A of the first port 141 is closer to the upper end of the valve body component 100 than the center position B of the second port 151 (that is, in the longitudinal direction, the position A is higher than the position B).

[0055] The beneficial effect of this technical solution is that when the control valve 10 is used as a throttle valve, because the inlet cavity is higher than the outlet cavity, the fluid medium passes through the side of the diaphragm 410 of the third cavity 160 opposite to the second valve port 130, and the pressure applied by the fluid medium to the diaphragm 410 includes the force generated by the height difference of the fluid medium in addition to the differential pressure of the fluid. Therefore, the pressure (back pressure) generated by the fluid medium is relatively large, and the diaphragm 410 is easily abutted against the second valve port 130 (although the spring can generate pressure on the diaphragm 410, because of the double-flow control of the control valve, the force applied by the compression spring 420 is designed to have little effect on the system, and to improve the sensitivity of the control valve 10 in the reverse opening of the valve). This solution avoids the risk that the back pressure of the diaphragm 410 may change when the fluid medium fluctuates, causing the second valve port 131 to leak.

[0056] To better illustrate the beneficial effect of the design, Figure 6 is a partial schematic view of a background technology. In this background technology, relative to the above technical solution, when the control valve is used as a throttle valve, along the longitudinal direction of the control valve, the flow path inlet cavity 810 is below the flow path outlet cavity 820, and the fluid flows upward through the throttle valve port 830 from the lower part. In this structure, the back force applied by the fluid medium to the diaphragm 410 is the differential pressure of the fluid medium. However, because the fluid cutoff flows upward from the lower part, the force generated by the height difference of the fluid medium has a negative effect on the back pressure. If the fluid cutoff is disturbed, it will affect the stability of the one-way valve core, causing the risk of internal leakage.

[0057] As a further technical solution, the first valve port 121 as a throttling function is a circular hole arranged longitudinally, and the second valve port 131 as a one-way cutoff function is a circular hole arranged transversely. The diameter D2 of the second valve port 131 is greater than 1.5 times the diameter D1 of the first valve port 121 (that is, 1.5XD1 < D2). Under this parameter setting, when the fluid medium flows in the reverse direction, the opening area of the second valve port 131 is relatively large compared to the area of the throttle port, and the full opening degree of the control valve is mainly affected by the second valve port.

[0058] As a further technical solution, in the throttling mode, in order to reduce the influence of high-pressure fluid in the first cavity 140 (inlet cavity) on the action of the valve stem 310, a longitudinal (up / down) opposite step is opened in the position of the valve stem 310 towards the first cavity 140, and the step surfaces of the step are respectively used as the first fluid pressure surface 311 and the second fluid pressure surface 312, which are designed to be opposite to the direction of the fluid pressure in the first cavity 140, so as to achieve the balancing effect.

[0059] In the above technical solution, the transmission rod 500 and the valve stem 310 are in a split structure. Of course, they can also be in an integrated structure.

[0060] As a further technical solution, in order to reduce the pressure influence of the compression spring 420 on the diaphragm 410 and improve the sensitivity of the control valve 10 in the reverse opening mode, in the state that the control valve 100 is not connected with fluid medium, the compression spring 420 is in a free state, the support part 192 supports and limits the diaphragm 410, the diaphragm 410 is overlapped on the compression spring 420, and the compression spring 420 does not generate elastic abutting force on the diaphragm 420. In the forward throttling mode, the back pressure is generated by the pressure of the fluid medium, and the second valve port 131 is closed. In the reverse one-way opening mode, the diaphragm 410 is displaced in the opening direction under the action of the pressure of the fluid medium, and when the diaphragm 410 is in a balanced state with the abutting position of the compression spring 420.

[0061] As a further extension of the technical solution, in the state that the control valve 100 is not connected with fluid medium, the diaphragm 410 is overlapped on the compression spring 420 in an inclined manner by its own gravity in the longitudinal direction of the control valve 10. The angle (B) between the diaphragm surface direction of the diaphragm 410 and the longitudinal axis of the control valve 10 is between 8° and 15°.

[0062] This design is convenient for product assembly. For example, in the assembly process, the spring and the diaphragm can be sequentially sleeved on the support rod of the connecting seat body to limit the movement space, the diaphragm can be temporarily positioned, the connecting seat body and the valve body can be assembled in the next step, and the diaphragm is positioned after the assembly of the connecting seat body and the valve body. When in the working state, the control valve is connected with fluid medium, the diaphragm can abut against the valve port or abut against the spring. The above operation is convenient and simple, and is convenient for unmanned automatic installation process.

[0063] The principles and specific implementation modes of the present application are described by using specific examples in the present application. The above description of the examples is only used to help understand the method of the present application and its core idea. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A control valve, comprising a valve body component, a power component and a first spool component, the first spool component comprising a first spool, the valve body component comprising a first valve port component, the first valve port component having a first valve port, the valve body component having a first cavity and a second cavity, the power component being capable of driving the first spool to displace relative to the first valve port component, the first valve port being capable of communicating the first cavity and the second cavity, characterized in that, further comprising a second spool component, the second spool component comprising a second spool, the valve body component further comprising a second valve port component, the second valve port component being adapted to the second spool, the second valve port component having a second valve port, the second valve port being closed when fluid medium flows from the first cavity to the second cavity, the second valve port being opened when fluid medium flows from the second cavity to the first cavity; the second spool component further comprising an elastic member, the second spool being a diaphragm, the elastic member being located on a side of the diaphragm opposite to the second valve port component, in a state that the control valve is not connected to fluid medium, the elastic member is in a free state and does not generate elastic abutting force to the diaphragm, the diaphragm is in a tilted manner and is lapped on the elastic member by its own gravity; the valve body component comprising a first mounting connecting surface and a second mounting connecting surface, the first cavity extends to the first mounting connecting surface to form a first port, the second cavity extends to the second mounting connecting surface to form a second port; along the longitudinal direction of the control valve, the power component is located at the upper part of the valve body component, the center position of the first port is closer to the upper end of the valve body component relative to the center position of the second port. the valve body component comprising a valve body, the first cavity, the second cavity, the first mounting connecting surface, the second mounting connecting surface are located in the valve body, the valve body further comprising a temperature sensing cavity, the temperature sensing cavity extends to the first mounting connecting surface to form a third port, the temperature sensing cavity extends to the second mounting connecting surface to form a fourth port, the control valve further comprising a transmission rod, the first spool comprising a valve rod, the power component is capable of abutting the transmission rod, the transmission rod passes through the temperature sensing cavity, the valve rod passes through the first cavity, the transmission rod and the valve rod are integrated or separate structure.

2. The control valve according to claim 1, characterized in that the transmission rod and the valve rod are longitudinally arranged, the first mounting connecting surface and the second mounting connecting surface are parallel to the axis of the valve rod.

3. The control valve according to claim 2, characterized in that the first cavity is a circular hole, the center axis of the first cavity is perpendicular to the first mounting connecting surface; the second cavity is a circular hole, the center axis of the second cavity is perpendicular to the second mounting connecting surface.

4. The control valve according to claim 2, characterized in that, the first valve port and the second valve port are circular holes, the diameter (D2) of the second valve port is greater than 1.5 times the diameter (D1) of the first valve port.

5. The control valve of claim 2, wherein the valve rod comprises a first fluid pressure surface and a second fluid pressure surface towards the first cavity, in the axial direction of the valve rod, the force direction of the first fluid pressure surface and the second fluid pressure surface are opposite.

6. Control valve according to any of claims 2-5, characterized in that ​ 7. The control valve according to claim 6, characterized in that The valve body further comprises a third cavity, and a connecting seat body is at least partially located in the third cavity, wherein the connecting seat body comprises an abutting surface, and the elastic member is located between the diaphragm and the abutting surface.

8. The control valve according to claim 7, characterized in that The valve body further comprises a third mounting connecting surface, and the third cavity is directed towards the third mounting connecting surface, wherein the first mounting connecting surface, the second mounting connecting surface and the third mounting connecting surface are perpendicular to each other, and the valve body is integrally manufactured from a molding material.

9. The control valve of claim 7, wherein The connecting seat body is fixedly connected with the valve body, the elastic member is a compression spring, and the connecting seat body comprises a supporting portion for supporting the diaphragm.

10. The control valve of claim 9, wherein In a state where the control valve is not connected with a fluid medium, the compression spring is in a free state, the diaphragm overlaps the compression spring, and in a longitudinal direction of the control valve, an included angle (B) between a diaphragm surface of the diaphragm and a longitudinal axis of the control valve is between 8° and 15°.

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