CN115264123A

CN115264123A - Control valve

Info

Publication number: CN115264123A
Application number: CN202110478738.9A
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 part, a power part, a first valve core part and a second valve core part, wherein the first valve core part comprises a first valve core, the second valve core part comprises a second valve core, and the valve body part is provided with a first cavity and a second cavity; the valve body comprises a first mounting connection surface and a second mounting connection surface, the first cavity extends towards the first mounting connection surface to form a first port, the second cavity extends towards the second mounting connection surface to form a second port, the power component is positioned at the upper part of the valve body component along the longitudinal direction of the control valve, the central position of the first port is closer to the upper end of the valve body component relative to the central position of the second port, and the opening/closing valve performance of the second valve core can be improved.

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 into the orifice member, but since the orifice member has a small structure, a direction control flow path is separately provided inside the orifice member, and it is necessary to consider stability of a product function.

Disclosure of Invention

The invention provides a control valve, which comprises a valve body component, a power component and a first 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 valve body component is provided with a first cavity and a second cavity, 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 and the second cavity;

further comprising a second valve core part comprising a second valve spool, the valve body part further comprising a second valve port part adapted to the second valve spool, the second valve port part having a second valve port which is closed when fluid medium flows from the first cavity to the second cavity and which is open when 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 towards the first mounting connecting surface to form a first port, and the second cavity extends towards the second mounting connecting surface to form a second port; the power member is located at an upper section of the valve body member in a longitudinal direction of the control valve, and a center position of the first port is located closer to an upper end of the valve body member than a center position of the second port.

The control valve provided by the invention can improve the opening/closing performance of the second valve core by relatively setting the central positions of the first port and the second port.

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: an enlarged schematic view of region K in fig. 3;

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

FIG. 6: a partial schematic diagram of a background art technology different from fig. 4.

Number designations in fig. 1-5 indicate:

10-control valve/thermostatic expansion valve;

100-valve body components;

110-a valve body;

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

120-a first valve port portion; 121-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 face, 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, 411-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 terms used herein are defined by the positions of the components shown in the drawings, and are only used for the sake of clarity and convenience in technical solution, and it should be understood that the 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, and fig. 3 is a sectional view of a Y-section in fig. 1.

As shown in fig. 1, 2 and 3. 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 enables the longitudinal displacement of the diaphragm 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 toward 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 a dynamic force balance in the longitudinal direction by the pressure of the diaphragm and the pressure of the spring 610. When the pressure of the medium in the air box of the power unit 200 changes, the diaphragm transmits the pressure change to the valve rod, and the new balance is achieved by the longitudinal movement of the valve rod 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.

The second spool part 400 includes a diaphragm 410 as a second spool. The valve body 110 includes a second valve port portion 130, the connection seat body 190 includes 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 disposed between the abutting surface 191 and the core portion 411 of 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 connecting seat body 190 has a 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 matched with 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 plays a role of throttling, and the control valve 10 serves as a throttling 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.

Fig. 4 is an enlarged view of a region K in fig. 3, and fig. 5 is an enlarged view of a region H in fig. 2.

As shown in fig. 4 and 5. In the above embodiment, the power unit 200 is mounted on the upper portion of the valve body unit 100 in the longitudinal direction of the control valve 10 (normally, the mounted state of the control valve 10 is the front-mounting state in the drawing). The center position a of the first port 141 is closer to the upper end of the valve body member 100 than the center position B of the second port 151 (i.e., the position a is higher than the position B in the longitudinal direction).

This solution is advantageous in that when the control valve 10 is used as a throttle valve, since the inlet chamber is higher than the outlet chamber, the fluid medium passes through the side of the diaphragm 410 of the third chamber 160 opposite to the second valve port portion 130, and the pressure applied to the diaphragm 410 by the fluid medium includes a force generated by a difference in height of the fluid medium in addition to a fluid differential pressure. 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 portion 130 (although the spring can generate pressure on the diaphragm 410, the influence of the force applied by the compression spring 420 on the system is small in design due to the two-way control of the control valve, and the sensitivity of the control valve 10 for opening the valve in the reverse direction is improved).

To better illustrate the benefits of this design, FIG. 6 is a partial schematic of a background art. In contrast to the above-described solution, in this background art, when the control valve is used as a throttle valve, the flow path inlet chamber 810 is below the flow path outlet chamber 820 in the longitudinal direction of the control valve, and the fluid passes through the throttle port 830 from below upward. In this configuration, the back force of the fluid medium applied to the diaphragm 410 is the differential pressure of the fluid medium. However, since the fluid stops flowing upward from the lower portion, the force generated by the difference in the height of the fluid medium negatively affects the back pressure. If the fluid is cut off and is disturbed, the stability of the one-way valve core can be influenced, and the hidden trouble of internal leakage is caused.

As a further technical solution, the first valve port 121 for throttling function is a circular hole shape arranged in the longitudinal direction, the second valve port 131 for one-way stopping function is a circular hole shape arranged in the transverse direction, and the diameter D2 of the second valve port 131 is larger than 1.5 times of the diameter D1 of the first valve port 121 (i.e. 1.5XD1 < D2). With this parameter setting, when the fluid medium flows in reverse, the opening area of the second valve port 131 is large relative to the area of the orifice, and the full opening degree of the control valve is mainly affected by the second valve port.

As a further technical solution, 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 a 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 receive the fluid pressure in the first cavity 140 in opposite directions, so as to achieve the equalizing effect.

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.

As a further technical solution, in order to reduce the pressure influence of the compression spring 420 on the diaphragm 410, the sensitivity of the control valve 10 to open in the reverse direction is increased. When the control valve 100 is not filled with the fluid medium, the compression spring 420 is in a free state, the supporting portion 192 supports and limits the diaphragm 410, the diaphragm 410 is overlapped with the compression spring 420, and the compression spring 420 does not generate elastic abutting force to the diaphragm 420. In the forward throttling mode, a back pressure is generated by the pressure of the fluid medium, closing the second 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 when displaced and abutted against the compression spring 420.

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 and the state that the control valve is filled with fluid medium, the diaphragm can be abutted to the valve opening part or the spring. The operation is convenient and simple, and the unmanned automatic installation process is convenient.

The principles and embodiments of the present invention have been described 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 comprises a valve body component, a power component and a first 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 valve body component is provided with a first cavity and a second cavity, 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 and the second cavity,

further comprising a second valve core part comprising a second valve spool, the valve body part further comprising a second valve port part adapted to the second valve spool, the second valve port part having a second valve port which is closed when fluid medium flows from the first cavity to the second cavity and which is open when 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 towards the first mounting connecting surface to form a first port, and the second cavity extends towards the second mounting connecting surface to form a second port; the power member is located at an upper portion of the valve body member in a longitudinal direction of the control valve, and a center position of the first port is located closer to an upper end of the valve body member than a center position of the second port.

2. The control valve according to claim 1, wherein the valve body member includes a valve body, the first cavity, the second cavity, the first mounting connection surface, and the second mounting connection surface are located on the valve body, the valve body further includes a temperature sensing cavity, the temperature sensing cavity extends toward the first mounting connection surface to form a third port, the temperature sensing cavity extends toward the second mounting connection surface to form a fourth port, the control valve further includes a transmission rod, the first valve element includes a valve rod, the power member can abut against the transmission rod, the transmission rod penetrates through the temperature sensing cavity, the valve rod penetrates through the first cavity, and the transmission rod and the valve rod are integrated or separated.

3. The control valve of claim 2, wherein the drive link is longitudinally disposed from the valve stem, and the first and second mounting interface surfaces are parallel to an axis of the valve stem.

4. The control valve of claim 2, wherein the first chamber is circular bore shaped, the first chamber having a central axis substantially perpendicular to the first mounting interface; the second cavity is in a circular hole shape, and the central axis of the second cavity is approximately vertical to the second mounting connecting surface.

5. The control valve of claim 2, wherein the first port and the second port are circular-hole shaped, and the diameter (D2) of the second port is greater than 1.5 times the diameter (D1) of the first port.

6. The control valve of any of claims 2-5, wherein the valve stem comprises a first fluid pressure surface and a second fluid pressure surface facing the first chamber, the first fluid pressure surface and the second fluid pressure surface being forced in opposite directions in an axial direction of the valve stem.

7. The control valve of claim 6, further comprising a connection seat, the valve body further comprising a third cavity, the connection seat being at least partially located in the third cavity, the connection seat comprising an abutment surface, the second valve core component further comprising a resilient member, the second valve core being in particular a diaphragm, the resilient member being located on a side of the diaphragm opposite the second valve port portion, the resilient member being located between the diaphragm and the abutment surface.

8. The control valve of claim 7, wherein the valve body further comprises a third mounting connection surface, the third cavity faces the third mounting connection surface, the first mounting connection surface, the second mounting connection surface and the third mounting connection surface are perpendicular to each other, and the valve body 110 is integrally formed of a molding material.

9. The control valve according to claim 7, wherein the connection seat is fixedly connected to the valve body, the elastic member is a compression spring, the connection seat includes a support portion, the support portion supports the diaphragm, and the compression spring does not generate an elastic abutting force against the diaphragm when the control valve is not filled with the fluid medium.

10. The control valve of claim 9 wherein in a condition where the control valve is not supplied with fluid medium, the compression spring is in a free condition, the diaphragm overlaps the compression spring, and in a longitudinal direction of the control valve, a direction of a face of the diaphragm is at an angle (B) of between 8 ° and 15 ° to a longitudinal axis of the control valve.