Fluid control valves

Abstract

The present invention discloses a fluid control valve, which at least includes a first valve body, a second valve body, and a first valve core. The fluid control valve has a first port, a second port, and a third port. The fluid control valve has a first connecting chamber and a connecting channel. The equivalent flow area of the connecting channel is smaller than the equivalent flow area of the first connecting chamber. The fluid control valve has a first working state and a second working state. In the first working state, the first port is connected to the second port, and the first valve core blocks the first port from being connected to the third port. In the second working state, the first port is connected to the third port, and the first valve core blocks the first port from being connected to the second port. In this way, the switching of the fluid flow path is achieved, and the structure of the fluid control valve is simple.

Description

Technical Field

[0001] The present invention relates to the field of fluid control. Background Art

[0002] Heat pump systems typically have cooling and heating modes, requiring a flow switching valve to switch the flow path. This valve can be a solenoid valve or an electric valve. For example, a three-way electric valve includes an inlet, a first outlet, and a second outlet. Refrigerant enters through the inlet, and the electric valve controls the inlet to connect to the first outlet, or vice versa. The electric valve requires internal control, such as through gears, resulting in a relatively complex structure and requiring electrical energy. Summary of the Invention

[0003] An object of the present invention is to provide a fluid control valve with low cost.

[0004] In order to achieve the above purpose, the following technical solutions are adopted:

[0005] A fluid control valve comprises at least a first valve body, a second valve body, and a first valve core, wherein the second valve body is fixed to the first valve body, the first valve body has a first valve body cavity, the first valve core is located in the first valve body cavity, and the first valve core slides relative to the side wall of the first valve body cavity.

[0006] The first valve body includes a first port, a second port, and a third port. The fluid control valve has a first working state and a second working state. In the first working state, the first port is in communication with the second port, and the first valve core blocks the communication between the first port and the third port. In the second working state, the first port is in communication with the third port, and the first valve core blocks the communication between the first port and the second port.

[0007] The fluid control valve has a first communicating cavity, defining the communicating space between the first valve core and the first port as the first communicating cavity. The fluid control valve has a communicating channel. In the first working state, the communicating channel connects the first port and the second port. The equivalent flow area of the communicating channel is smaller than the equivalent flow area of the first communicating cavity.

[0008] The fluid control valve of the above technical solution includes a first port, a second port and a third port. The fluid control valve has a first working state and a second working state. In the first working state, the first port is connected to the second port. In the second working state, the first valve core blocks the connection between the first port and the second port. Since the equivalent flow area of the connecting channel of the fluid control valve is smaller than the equivalent flow area of the first connecting chamber, the fluid control valve can have a first working state and a second working state when the fluid pressure at the first port is different, thereby realizing the switching connection of different ports of the fluid control valve, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0010] Figure 2 for Figure 1 Another working state diagram of the structure shown;

[0011] Figure 3 for Figure 1 Schematic diagram of the structure of the middle valve body;

[0012] Figure 4 for Figure 1 Schematic diagram of the structure of the middle valve core;

[0013] Figure 5 It is a structural schematic diagram of another embodiment of the present invention;

[0014] Figure 6 It is a structural schematic diagram of another embodiment of the present invention;

[0015] Figure 7 for Figure 6 Another working state diagram of the structure shown;

[0016] Figure 8 for Figure 6 Schematic diagram of the structure of the third valve body. DETAILED DESCRIPTION

[0017] Reference Figure 1 、 Figure 2 , Figure 1 、 Figure 2 A schematic diagram of the structure of a fluid control valve is shown, wherein Figure 1 is a cross-sectional view of the fluid control valve 100 in a first working state; Figure 2 FIG. 4 is a cross-sectional view of the fluid control valve 100 in the second working state.

[0018] The fluid control valve 100 includes at least a first valve body 11, a second valve body 12, and a first valve core 13. The second valve body 12 is fixed to the first valve body 11. The first valve body 11 has a first valve body inner cavity 111. The first valve core 13 is located in the first valve body inner cavity 111. The first valve core 13 slides relative to the side wall of the first valve body inner cavity 111.

[0019] The first valve body 11 includes a first port 101, a second port 102, and a third port 103. The fluid control valve 100 has a first working state and a second working state. In the first working state, the first port 101 is connected to the second port 102, and the first valve core 13 blocks the first port 101 from being connected to the third port 103. In the second working state, the first port 101 is connected to the third port 103, and the first valve core 13 blocks the first port 101 from being connected to the second port 102. In this article, the term "blocking" is not limited to the case where the flow rate is zero, but includes the case where there is a slight leakage.

[0020] The fluid control valve 100 has a first communication chamber 104, defining the connecting space between the first valve core 13 and the first port 101 as the first communication chamber 104. The fluid control valve 100 also has a communication channel 105. In a first operating state, the communication channel 105 connects the first port 101 and the second port 102. The equivalent flow area of the communication channel 105 is smaller than the equivalent flow area of the first communication chamber 104. Consequently, when the flow rate of fluid entering the first port 101 is high, the first valve core 13 is impacted and slides relative to the sidewall of the first valve body inner chamber 111, thereby connecting the first port 101 and the third port 103. This allows the fluid control valve 100 to function in two states and achieve flow path switching. Furthermore, the switching between the two states of the fluid control valve is affected by the fluid flow rate / pressure at the first port, reducing the energy consumption of the external drive source to actuate the valve. Furthermore, the fluid control valve also has a very simple structure.

[0021] The working state of the fluid control valve 100 is: Figure 1 , the first port 101 is connected to the system high pressure, the first port 101 is connected to the second port 102 , the third port 103 has no system pressure, and the first valve core 13 is in the first working state.

[0022] Reference Figure 2 The first port 101 is connected to the system high pressure. When the flow at the first port 101 increases to a certain level, the first valve core 13 is in the second working state, the first port 101 is connected to the third port 103, and the fluid pressure at the third port 103 is high pressure.

[0023] In this way, the fluid enters from the first port 101 and can leave from the second port 102 or the third port 103 , thereby realizing the switching of the flow path.

[0024] Combined with reference Figure 3 and Figure 4 The first valve core 13 has a head 131 and a first spring portion 132. One end of the first spring portion 132 abuts against the head 131, and one end of the first spring portion 132 abuts against the valve body 11. The head 131 and the side wall of the first valve body cavity 111 are slidingly sealed.

[0025] The head 131 has a top portion 1311 and a side portion 1312. The side portion 1312 slides relative to the side wall of the first valve body inner cavity 111. The top portion 1311 forms part of the wall of the first connecting cavity 104 and has an edge portion 1313. In a first operating state, the edge portion 1313 abuts against the side wall of the first valve body inner cavity 111. The first valve core has a first spring portion. In the first operating state, the first spring portion applies force to the first valve core, causing the edge portion of the top portion of the head to abut against the inner wall of the first valve body, and the side portion of the head to slide and seal against the inner wall of the first valve body. In this way, after fluid enters from the first port, it will pass through the circulation channel and enter the second port. The structural design of the first valve core is simple and low in cost.

[0026] Define the fluid pressure on the head portion 131 as F1, the fluid pressure on the second port 102 as F2, and the spring force as F. In the first operating state, F>F1-F2; in the second operating state, F1>F2+F. The spring force refers to the force applied by the first spring portion 132 to the head portion 131. By setting the spring force of the first spring portion, the fluid control valve connects the first port and the second port in the first operating state. In the second operating state, the pressure of the fluid from the first port on the head portion is greater than the sum of F2 and F, causing the first valve core to move axially, connecting the first port and the third port.

[0027] The first valve body 11 and the second valve body 12 are fixed to form a communicating passage. The inner cavity 111 of the first valve body includes a second communicating cavity 112. The second communicating cavity 112 is located between the second port 102 and the first valve core 13. The first valve body 11 has a communicating groove 113, which defines the movement direction of the first valve core 13 as the first direction. The communicating groove 113 extends along the first direction. The bottom wall of the communicating groove 113 has a first through hole 1131 and a second through hole 1132. The first through hole 1131 is connected to the first communicating cavity 104, and the second through hole 1132 is connected to the second communicating cavity 112. The second valve body 12 has a wall portion corresponding to the communicating groove 113, and the second valve body 12 is sealed with the first valve body 11; the length of the circumferential side portion 1312 along the first direction is greater than the aperture of the second through hole 1132, and the length of the circumferential side portion 1312 along the first direction is greater than the aperture of the third port 103. The first port and the second port are connected via a connecting groove, and the structural design of the connecting groove facilitates processing, especially when the fluid control valve is designed to include at least a first valve body and a second valve body, which makes processing of the connecting groove easier and helps reduce costs.

[0028] The first valve body 11 includes a main body 114 and a cover 116. The head 131 and the first spring portion 132 are located in the main body 114. The cover 116 has a raised portion 1161 that extends into the inner cavity 111 of the first valve body. One end of the first spring portion 132 abuts against the raised portion 1161. The raised portion 1161 has a communication port 1162. The equivalent inner diameter of the communication port 1162 is smaller than the equivalent inner diameter of the first spring portion 132. The communication port 1162 is coaxially arranged with the first spring portion 132. The first valve body includes a main body and a cover. The head and other structures of the first valve core can be located in the main body and assembled through the cover. This facilitates assembly of the fluid control valve, reduces manufacturing difficulty, and thus reduces manufacturing cost.

[0029] As an implementation method, refer to Figure 5 The first valve body 11 includes a main body 114, an insert 115, and a cover 116. The main body 114 and the cover 116 are sealed together. The insert 115 is located in the communication groove 113, and the outer wall of the insert 115 cooperates with the side wall of the communication groove 113. The main body 114, the insert 115, and the second valve body 12 cooperate to form a communication channel. The second valve body 12 is sealed together with the main body 114. Since the flow area of the communication channel has certain requirements, in order to achieve that valves with different requirements can share a valve body, the flow area of the communication channel can be adjusted to meet the valve performance requirements by providing an insert. This is also conducive to mass production and reduces costs.

[0030] Reference Figure 6 、 Figure 7 , as an implementation method, Figure 6 、 Figure 7Another structural schematic diagram of the fluid control valve 200 is shown.

[0031] The fluid control valve 200 includes a third valve body 14, which is fixed to the first valve body 11. The third valve body 14 has a fourth port 106 and a fifth port 107. The fluid control valve 200 includes a second valve core 15. The third valve body 14 has a second valve body inner cavity 141. The second valve core 15 is located in the second valve body inner cavity 141. The second valve core 15 slides relative to the side wall of the second valve body inner cavity 141. In the first working state, the fourth port 106 is connected to the fifth port 107. In the second working state, the first port 101, the third port 103, and the fifth port 107 are connected. The second valve core 15 blocks the fourth port 106 from being connected to the second valve body inner cavity 141.

[0032] The fluid control valve 200 includes a thermal insulation member 17 positioned between the first valve body 11 and the third valve body 14. The first valve body 11 has a protrusion 118 extending into the third valve body 14. The thermal insulation member 17 includes a base 171 and a cylindrical portion 172. The cylindrical portion 172 protrudes and extends from the base 171 and is sheathed within the protrusion 118. The base 171 is positioned between the first valve body 11 and the third valve body 14. The cylindrical portion 172 is sealed against the first valve body 11 and against the third valve body 14. The thermal insulation member 17 can be made of, for example, ester, plastic, or other material with low thermal conductivity. The provision of the thermal insulation member helps isolate heat from the first and third valve bodies, thereby reducing heat loss.

[0033] Combined with reference Figure 8 The second valve core 15 has a circulation area 151, and the circulation area 151 has a first area 1511 and a second area 1512. The sliding movement direction of the second valve core 15 relative to the side wall of the inner cavity 141 of the second valve body is defined as the second direction. The first area 1511 extends along the second direction, the second area 1512 intersects with the first area 1511, and the second area 1512 is connected to the first area 1511. In the first working state, the circulation area 151 is connected to the fifth port 107 and the fourth port 106. In the second working state, the second valve core 15 blocks the fifth port 107 and the fourth port 106.

[0034] The second valve core 15 has a second spring portion 152 and a core body portion 153. The core body portion 153 has a first flange portion 1531 and a second flange portion 1532. The second direction is the axial direction of the second valve core 15. The first flange portion 1531 and the second flange portion 1532 protrude in the radial direction of the second valve core 15. The first flange portion 1531 is sealed with the wall portion of the second valve body inner cavity 141, and the second flange portion 1532 is cooperated with the wall portion of the second valve body inner cavity 141. The core body portion 153 has two or more support arms 1533. The support arms 1533 integrally connect the first flange portion 1531 and the second flange portion 1532. The support arms 1533 are arranged at intervals. Adjacent support arms 1533 form at least a portion of the second zone 1512 in the radial outward direction of the second valve core 15. The area surrounded by adjacent support arms 1533 is the first zone 1511. At least a portion of the second spring portion 152 is located in the first zone 1511.

[0035] The working state of the fluid control valve 200 is: Figure 6 The first port 101 is connected to the system high pressure, the first port 101 is connected to the second port 102, the third port 103 has no system pressure, the first valve core 13 is in the first working state, the fourth port 106 can also be connected to the system high pressure, the fluid enters from the fourth port 106 and leaves from the fifth port 107.

[0036] Reference Figure 7 The first port 101 is connected to the system high pressure. When the flow at the first port 101 increases to a certain level, the first valve core 13 is in the second working state, the first port 101 is connected to the third port 103, and the fluid pressure at the third port 103 is high pressure. The fluid at the third port 103 forces the second valve core 15 to move, so that the third port 103 is connected to the fifth port 107.

[0037] In this way, the fluid enters from the first port 101 and can leave from the second port 102 or the fifth port 107 , thereby realizing the switching of the flow path.

[0038] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. For example, regarding the directional definitions of “front”, “back”, “left”, “right”, “up” and “down”, although this specification has described the present invention in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be combined, modified or replaced by each other, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A fluid control valve comprising at least a first valve body, a second valve body, and a first valve core, wherein the second valve body is fixed to the first valve body, the first valve body has a first valve body cavity, the first valve core is located in the first valve body cavity, and the first valve core slides relative to a side wall of the first valve body cavity. The first valve body includes a first port, a second port, and a third port. The fluid control valve has a first working state and a second working state. In the first working state, the first port is in communication with the second port, and the first valve core blocks the communication between the first port and the third port. In the second working state, the first port is in communication with the third port, and the first valve core blocks the communication between the first port and the second port. The fluid control valve has a first communication cavity, defining a communication space between the first valve core and the first port as the first communication cavity, and the fluid control valve has a communication channel. In the first working state, the communication channel connects the first port and the second port, and an equivalent flow area of the communication channel is smaller than an equivalent flow area of the first communication cavity; The first valve core has a head and a first spring part, one end of the first spring part is against the head, and the other end of the first spring part is against the first valve body, and the head and the side wall of the first valve body cavity are slidingly sealed; the fluid pressure on the head is defined as F1, the fluid pressure of the second port is defined as F2, and the spring force is defined as F. In the first working state, F>F1-F2; in the second working state, F1>F2+F; wherein the spring force refers to the force applied by the first spring part to the head.

2. The fluid control valve according to claim 1, wherein: The head has an end top and a peripheral side portion, the peripheral side portion slides relative to the side wall of the inner cavity of the first valve body, the end top is a part of the wall portion forming the first connecting cavity, and the end top has an edge portion, and in the first working state, the edge portion is against the inner wall of the first valve body.

3. The fluid control valve according to claim 1 or 2, characterized in that: The first valve body and the second valve body are fixed to form the communication channel. The inner cavity of the first valve body includes a second communication cavity, and the second communication cavity is located between the second port and the first valve core. The first valve body has a communication groove, defining the movement direction of the first valve core as a first direction, the communication groove extends along the first direction, the bottom wall of the communication groove has a first through hole and a second through hole, the first through hole is in communication with the first communication cavity, and the second through hole is in communication with the second communication cavity, the second valve body has a wall portion corresponding to the communication groove, and the second valve body is sealed with the first valve body; The length of the peripheral side portion along the first direction is greater than the aperture of the second through hole, and the length of the peripheral side portion along the first direction is greater than the aperture of the third port.

4. The fluid control valve according to claim 3, wherein: The first valve body includes a main body, an insert, and a cover body. The main body and the cover body are sealed. The insert is located in the communicating groove. The outer wall of the insert is matched with the side wall of the communicating groove. The main body, the insert, and the second valve body cooperate to form the communicating channel. The second valve body and the main body are sealed.

5. The fluid control valve according to claim 2, wherein: The first valve body includes a main body and a cover body, the head and the first spring part are located in the main body, the cover body has a protrusion, the protrusion extends into the inner cavity of the first valve body, one end of the first spring part is against the protrusion, the protrusion has a connecting port, the equivalent inner diameter of the connecting port is smaller than the equivalent inner diameter of the first spring part, and the connecting port is coaxially arranged with the first spring part.

6. The fluid control valve according to claim 1, wherein: The fluid control valve includes a third valve body, which is fixed to the first valve body and has a fourth port and a fifth port. The fluid control valve includes a second valve core, and the third valve body has an inner cavity of a second valve body. The second valve core is located in the inner cavity of the second valve body, and the second valve core slides relative to the side wall of the inner cavity of the second valve body. In the first working state, the fourth port is connected to the fifth port. In the second working state, the first port, the third port and the fifth port are connected, and the second valve core blocks the fourth port from being connected to the inner cavity of the second valve body.

7. The fluid control valve according to claim 6, characterized in that: The fluid control valve includes a heat-insulating component, which is located between the first valve body and the third valve body; the first valve body has a protrusion, which extends into the third valve body, and the heat-insulating component has a base and a cylindrical portion, the cylindrical portion protrudes and extends from the base, and the cylindrical portion is sleeved on the protrusion, the base is located between the first valve body and the third valve body, the cylindrical portion is sealed against the first valve body, and the cylindrical portion is sealed against the third valve body.

8. The fluid control valve according to claim 6, wherein: The second valve core has a flow area, and the flow area has a first area and a second area. The sliding movement direction of the second valve core relative to the side wall of the inner cavity of the second valve body is defined as the second direction. The first area extends along the second direction, the second area intersects with the first area, and the second area is connected with the first area. In the first working state, the flow area connects the fifth port and the fourth port. In the second working state, the second valve core blocks the fifth port and the fourth port.

9. The fluid control valve according to claim 8, characterized in that: The second valve core has a second spring portion and a core portion, the core portion has a first flange portion and a second flange portion, the second direction is the axial direction of the second valve core, the first flange portion and the second flange portion protrude in the radial direction of the second valve core, the first flange portion is sealed with the inner cavity wall portion of the second valve body, the second flange portion is cooperated with the inner cavity wall portion of the second valve body, the core portion has two or more support arms, the support arms integrally connect the first flange portion and the second flange portion, the support arms are spaced apart, adjacent support arms form at least part of the second zone in the radial outward direction of the second valve core, the area surrounded by adjacent support arms is the first zone, and at least part of the second spring portion is located in the first zone.

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