CN115264122A

CN115264122A - Control valve

Info

Publication number: CN115264122A
Application number: CN202110478570.1A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Climate and Appliance Controls Group Co Ltd
Current assignee: Zhejiang Sanhua Commercial Refrigeration Co ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2022-11-01

Abstract

The invention discloses a control valve, which comprises a valve body component, a power component, a first valve core component and a second valve core component, wherein 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 is provided with a first valve port, the second valve core component comprises a second valve core and an elastic part, the valve body component comprises a second valve port part, the core part of the second valve core is positioned between the elastic part and the second valve port part, and the elastic part does not apply pressure to the second valve core when the control valve is in a state of not introducing a fluid medium.

Description

Control valve

Technical Field

The invention belongs to the technical field of fluid control, and particularly relates to a control valve.

Background

In a vehicle or household air conditioning system, an evaporator, a condenser, a compressor and a throttling component are required, a general refrigeration system needs to arrange the throttling component in front of the evaporator, and the flow direction of the throttling component is constant. Sometimes, in order to meet the requirements of different modes of the system, a reverse flow path needs to be arranged for the flow direction of the refrigerant in the system, and at the moment, valves and pipeline parts need to be additionally arranged, so that more pipelines are connected in the system, and the number of parts is larger. As one solution, a direction flow path control function is integrated in the orifice member, but since the orifice member has a small structure, a direction control flow path is separately provided in the orifice member, and stability of a product function needs to be considered.

Disclosure of Invention

The control valve comprises a valve body component, a power component, a first valve core component and a second valve core component, wherein 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 is provided with a first valve port, the second valve core component comprises a second valve core and an elastic part, the valve body component comprises a second valve port part, a core part of the second valve core is positioned between the elastic part and the second valve port part, and when a fluid medium is not introduced into the control valve, the elastic part does not apply pressure to the second valve core;

the valve body component further comprises a first cavity and a second cavity, when fluid medium flows from the first cavity to the second cavity, the power component can drive the first valve core to displace relative to the first valve port part, and the second valve core abuts against the second valve port part; when the fluid medium flows from the second cavity to the first cavity, the second valve core is displaced towards the elastic element, and the elastic element applies pressure to the second valve core. The control valve provided by the invention can improve the flexibility of opening the second valve core.

Drawings

FIG. 1: the invention provides a schematic overall structure diagram of a control valve;

FIG. 2: cross-sectional view of section X in fig. 1;

FIG. 3: a cross-sectional view of section Y in fig. 1;

FIG. 4 is a schematic view of: an enlarged schematic view of region K in fig. 3;

FIG. 5 is an enlarged view of the region H in FIG. 2.

Number designations in fig. 1-5 indicate:

10-control valve/thermostatic expansion valve;

100-a valve body component;

110-a valve body;

111-upper accommodation cavity, 112-lower accommodation cavity, 113-central hole;

120-a first valve port portion; 121-a first valve port;

130-a second valve port portion; 131-a second valve port;

140-a first cavity;

141-a first port;

150-a second cavity;

151 a second port;

160-a third cavity;

170-temperature sensing cavity;

171-third port, 172-fourth port;

181-first mounting connection surface, 182-second mounting connection surface, 183-third mounting connection surface;

190-connecting the base;

191-abutment surface, 192-support;

200-a power component;

300-a first spool component;

310-a first poppet/stem;

311-first fluid force bearing surface, 312-second fluid force bearing surface;

400-a second valve core component;

410-second valve core/diaphragm, 412-core portion;

420-elastic/compression spring;

500-a transmission rod;

600-a balancing support member;

610-spring, 620-support seat;

810-flow path inlet chamber, 820-flow path outlet chamber;

830-throttle valve port, 840-check valve port.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. The upper and lower directional terms used herein are defined by the positions of the components shown in the drawings, and are only used for clarity and convenience of technical solution, and it should be understood that the directional terms used herein should not limit the scope of the claims; it will also be appreciated that the structural relationships illustrated herein, whether connected, secured, abutted, etc., are intended to encompass direct and indirect methods, unless specifically noted to embody the inventive concepts thereof.

Fig. 1 is an overall structural view of a control valve according to the present invention, fig. 2 is a sectional view of an X-section in fig. 1, fig. 3 is a sectional view of a Y-section in fig. 1, fig. 4 is an enlarged view of a K-region in fig. 3, and fig. 5 is an enlarged view of a H-region in fig. 2.

As shown in fig. 1, 2, 3, 4 and 5. In this embodiment, the control valve is embodied as a thermostatic expansion valve. The thermostatic expansion valve 10 includes a valve body member 100. In this embodiment, the valve body 110 of the valve body member 100 is integrally formed by molding material.

The valve body 110 has a first mounting connection surface 181, a second mounting connection surface 182, and a third mounting connection surface 183 formed on the side surface thereof, and the mounting connection surfaces are substantially perpendicular to each other.

An upper accommodating cavity 111 is formed in the upper longitudinal portion of the valve body 110, a mounting thread is formed on the side wall of the accommodating cavity 111, and the power component 200 is fixedly mounted on the valve body 110 through the mounting thread. The power unit 200 includes a bellows that is capable of longitudinal displacement when the pressure of the medium in the bellows changes. A lower accommodating cavity 112 is formed at the lower end of the valve body 110 in the longitudinal direction, a mounting thread is formed on the side wall of the lower accommodating cavity 112, and the balance support member 600 is fixedly mounted on the valve body 110 through the mounting thread. The valve body 110 further includes a central hole 113 disposed in a longitudinal direction, and the central hole 113 penetrates the upper receiving chamber 111 and the lower receiving chamber 112.

The control valve further comprises 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 connection surface 181, and the first cavity 140 extends towards the first mounting connection surface 181 to form a first port 141; similarly, the central axis of the second cavity 150 is substantially perpendicular to the second mounting connection surface 182, the second cavity 150 extends toward the second mounting connection surface 182 to form a second port 151, and the central hole 113 penetrates through the first cavity 140 and the second cavity 150.

The first spool member 300 includes a valve rod 310 as a first spool, and a spring 610 abuts between a lower end of the valve rod 310 and a weight seat 620 of the balance support member 600. The transmission rod 500 is inserted into the central hole 113, the upper end of the transmission rod 500 abuts against the diaphragm of the power unit 200, and the lower end of the transmission rod 500 abuts against the valve stem 310. Thus, 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 unit 200 changes, the diaphragm transmits the pressure change to the valve stem, and a new balance is achieved by the longitudinal movement of the valve stem 310.

The valve body 110 further includes a temperature sensing cavity 170, the temperature sensing cavity 170 is disposed at a position longitudinally close to the diaphragm, and the temperature sensing cavity 170 is communicated with the accommodating cavity 111 through the central hole 113. The temperature sensing cavity 170 extends toward the first mounting connection surface 181 to form a third port 171, and the temperature sensing cavity 170 extends toward the second mounting connection surface 182 to form a fourth port 172. The media of the system passes through the temperature sensing chamber 170 and can transmit pressure to the diaphragm, which will transmit pressure changes to the valve stem, to achieve a new equilibrium by longitudinal movement of the valve stem 310.

A first valve port 121 is formed between the first cavity 140 and the second cavity 150. The valve rod 310 is made into a specific shape 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 rod 310 relative to the first valve port part 120 of the first valve port 121, so as to achieve the purpose of controlling the throttling function of the valve.

The valve body 110 further includes a third cavity 160, the third cavity 160 faces the third mounting surface 183, and the connection seat 190 is mounted to the third cavity 160 through a threaded connection.

In this embodiment, the second valve core component 400 includes a diaphragm as the second valve core 410. The valve body 110 includes a second valve port portion 130, the connection seat body 190 includes an abutting surface 191, the core portion 411 of 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 disposed between the abutting surface 191 and the diaphragm 410, that is, the compression spring 420 is located on the side of the diaphragm 410 opposite to the second valve port portion 130. The connection seat body 190 has a substantially cylindrical structure, and includes a support portion 192, and the support portion 192 can support the diaphragm 410 (in the position shown in fig. 4). In this embodiment, the supporting portion 192 is three supporting rods fixed to the abutting surface 191 of the connection housing 190, and the three supporting rods are annularly arranged to define the moving space of the diaphragm 410.

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, the first valve port 121 performs a throttling function, and the control valve 10 acts as a throttle valve; when the fluid medium in the control valve 10 flows from the second chamber 150 to the first chamber 140, the diaphragm 410 is separated from the second valve port portion 130 by the fluid pressure, the second valve port 131 is opened, and the control valve 10 is a normal-open valve.

In the throttling mode, in order to reduce the influence of the high-pressure fluid in the first cavity 140 (inlet cavity) on the action of the valve rod 310, the valve rod is provided with longitudinally (up/down) opposite steps at the position facing the first cavity 140, the step surfaces of the steps are respectively used as a first fluid pressure receiving surface 311 and a second fluid pressure receiving surface 312, and the first fluid pressure receiving surface 311 and the second fluid pressure receiving surface 312 are designed to be opposite in direction to the fluid pressure in the first cavity 140, so that the balancing effect is achieved.

In the above technical solution, the transmission rod 500 and the valve rod 310 are of a separate structure. Of course, an integral structure may be provided.

To reduce the pressure effect of the compression spring 420 on the diaphragm 410, the sensitivity of the control valve 10 to reverse opening is increased. When the control valve 100 is not in a fluid medium state (product factory state), the compression spring 420 is in a free state, the supporting portion 192 supports and limits the diaphragm 410, the diaphragm 410 is lapped 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, a back pressure is generated by the pressure of the fluid medium, closing the second valve port 131. In the reverse one-way valve opening mode, the diaphragm 410 is displaced in the valve opening direction by the pressure of the fluid medium, and the diaphragm 410 is in a balanced state in abutment with the compression spring 420 after displacement.

As a further extension of this solution, in the state in which the control valve 100 is not supplied with fluid medium, the diaphragm 410 overlaps the compression spring 420 in an inclined manner by its own weight in the longitudinal direction of the control valve 10. The one-sided orientation of the diaphragm 410 is at an angle (B) of between 8 deg. and 15 deg. to the longitudinal axis of the control valve 10.

This design facilitates assembly in the product. In the assembling process, the spring and the diaphragm can be sleeved into the supporting rod on the connecting seat body to limit the moving space, the diaphragm can be temporarily limited, the connecting seat body and the valve body can be conveniently assembled on the next step, and the diaphragm is limited after the connecting seat body and the valve body are assembled. When the working state is realized, the diaphragm can abut against the valve opening part or the spring after the control valve is in a fluid medium introducing state. The operation is convenient and simple, and the unmanned automatic installation process is convenient.

As an extension of the technical scheme of the present invention, a sealing ball made of a non-metal material may be used instead of the diaphragm, and the sealing ball has a relatively low specific gravity and can be flexibly displaced under the pressure of a fluid medium to realize the above functions, which is not described herein again.

Similarly, the "diaphragm" in the above technical solution may also be deformed appropriately, so long as the "sheet-like, light" characteristic of the second valve core is maintained, the valve can be closed conveniently, and the second valve core can also be moved conveniently to achieve the above function, which is not described herein again.

As an extension of the technical scheme of the invention, a non-metal material with the density approximately equal to that of the fluid medium can be used to replace the diaphragm to serve as the second valve core, the influence of the gravity is small, and the diaphragm can be flexibly displaced under the pressure action of the fluid medium to realize the functions, so that the details are not repeated.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A control valve comprising a valve body component, a power component, a first valve core component, the first valve core component comprising a first valve core, the valve body component comprising a first valve port portion, the first valve port portion having a first valve port, characterized in that,

the valve body component comprises a second valve port part, a core part of the second valve core is positioned between the elastic part and the second valve port part, and the elastic part does not apply pressure to the second valve core in a state that the control valve is not communicated with fluid medium;

the valve body component further comprises a first cavity and a second cavity, when fluid medium flows from the first cavity to the second cavity, the power component can drive the first valve core to displace relative to the first valve port part, and the second valve core abuts against the second valve port part; when the fluid medium flows from the second cavity to the first cavity, the second valve core is displaced towards the elastic element, and the elastic element applies pressure to the second valve core.

2. The control valve of claim 1 wherein said second spool part further comprises a support portion, said second spool is a diaphragm, said support portion supports said diaphragm, said resilient member is a compression spring, and said compression spring is in a free state when said control valve is not energized with a fluid medium.

3. The control valve of claim 2, wherein in a state in which the control valve is not supplied with fluid medium, the diaphragm overlaps the compression spring, and an angle (B) between a plane direction of the diaphragm and a longitudinal axis of the control valve in a longitudinal direction of the control valve is between 8 ° and 15 °.

4. The control valve of claim 1, wherein the second spool part further comprises a support part, the second spool part is a sealing ball made of a non-metallic material, the support part supports the sealing ball, the elastic part is a compression spring, the compression spring is in a free state when the control valve is not filled with fluid medium, and when the fluid medium flows from the second cavity to the first cavity, the compression spring is compressed by the displacement of the sealing ball.

5. The control valve of claim 1 wherein the second spool component further comprises a support portion, the second spool component having a density substantially equal to a density of the fluid medium, the support portion supporting the second spool, the resilient member being a compression spring, the compression spring being free in a condition where the control valve is not charged with the fluid medium, the sealing ball being displaced to compress the compression spring when the fluid medium flows from the second chamber to the first chamber.

6. The control valve of any of claims 2-5, further comprising a connection seat, wherein the valve body member further comprises a third cavity, wherein the connection seat is at least partially located in the third cavity, wherein the connection seat is fixedly connected to the valve body, wherein the connection seat comprises the support portion and an abutment surface, and wherein the compression spring is located between the abutment surface and the second valve spool.

7. The control valve according to claim 6, wherein the connecting seat is a cylindrical structure, the support portions are three support rods, the support rods are fixed to ends of the cylindrical structure, the three support rods are annularly arranged to define a moving space of the second valve element, and the abutting surfaces are located at the ends.

8. The control valve according to any one of claims 1 to 5, wherein the valve body component comprises a valve body, the valve body comprises the first cavity and the second cavity, the control valve further comprises a transmission rod, the first valve core comprises a valve rod, the power component can abut against the transmission rod, the valve rod penetrates through the first cavity, and the transmission rod and the valve rod are of an integrated or split structure.

9. The control valve of claim 8 wherein the valve stem includes first and second fluid pressure surfaces facing the first chamber, the first and second fluid pressure surfaces being biased in opposite directions in an axial direction of the valve stem.

10. The control valve of claim 8, wherein the valve body includes a first mounting interface and a second mounting interface, the first cavity extending toward the first mounting interface to form a first port, the second cavity extending toward the second mounting interface to form a second port, the actuator stem being longitudinally disposed from the valve stem, the first mounting interface and the second mounting interface being parallel to an axis of the valve stem; the valve body further comprises a temperature sensing cavity, and the transmission rod penetrates through the temperature sensing cavity. The temperature sensing cavity extends towards the first mounting connection surface to form a third port, and the temperature sensing cavity extends towards the second mounting connection surface to form a fourth port.