Integrated bidirectional variable restrictor

Abstract

An integrated bidirectional variable throttle valve is composed of a valve pipe, a valve seat, a filter screen, a valve core component a, a valve core component b and a big spring; the valve core component a comprises an inner valve core, a small spring and a valve core a; the valve core component b comprises an inner valve core, a small spring and a valve core b. A variable throttle one-way channel opposite to the original flow direction is constructed in the abdomen of the one-way valve core, so that the valve core component has the function of mutual restriction in the forward and reverse directions. The two valve core components with the same function are combined reversely, and the refrigerant channels of the two valve core components are interpenetrated, so that the bidirectional flow and bidirectional variable throttle of the refrigerant can be achieved. Since the two valve core components are flexibly connected by the spring, the change of the acting force between the two valve core components can produce the positive effect, so that the system fluctuation caused by the refrigerant liquid switching can be relieved, and the noise reduction effect can be achieved. The utility model also has the advantages of small size, simple structure, easy processing and low manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to an integrated bidirectional variable throttle valve. Background Technology

[0002] Existing bidirectional throttling valves come in a wide variety of types, each with its own structural advantages and disadvantages. They generally employ a configuration of two throttling valve assemblies connected in parallel or series to achieve bidirectional refrigerant flow while regulating refrigerant flow. However, these types of bidirectional throttling valves suffer from drawbacks such as large size, high material consumption, and high manufacturing costs. While bidirectional throttling valves with a single integrated valve tube design offer the ability to switch refrigerant flow in both directions, they cannot provide a wide range of bidirectional refrigerant flow regulation. Summary of the Invention

[0003] This utility model provides an integrated bidirectional variable throttling valve, employing a valve-within-a-valve design. A variable throttling unidirectional channel, opposite to the original flow direction, is constructed within the body of the unidirectional valve core, making it a valve core component with mutually restrictive forward and reverse functions. By combining two essentially identical valve core components in reverse, and interconnecting their refrigerant channels, bidirectional refrigerant flow and bidirectional variable throttling are achieved. Simultaneously, because the two valve core components are flexibly linked by springs, changes in the force between them can produce a positive effect, thereby mitigating system fluctuations caused by refrigerant direction switching and providing a certain degree of noise reduction. Furthermore, this utility model also has advantages such as small size, simple structure, ease of processing, and low manufacturing cost.

[0004] This utility model is implemented as follows: it consists of a valve tube, a valve seat, a filter screen, valve core component a, valve core component b, and a large spring. Valve core component a includes an inner valve core, a small spring, and valve core a; valve core component b includes an inner valve core, a small spring, and valve core b. The valve tube is circular and serves as the housing of this utility model. All other components are installed inside the valve tube, which is made of metal. The valve seat is cylindrical, with its outer diameter matching the inner diameter of the valve tube. The valve seat is fixed to the valve tube, and its outer diameter has a positioning groove for fixing to the valve tube. A circular hole in the center of the valve seat serves as a refrigerant channel, and the orifice has a tapered opening that matches the cone shape of valve core a or valve core b. The valve seat can be made of metal or high-strength nylon. The filter screen is bowl-shaped or spherical, made of metal, and fixed to the valve seat. The inner valve core is made of metal and is cylindrical in shape with an outward-curving step at the open end. The cylinder body and the outward-curving step are clearance-fitted at the corresponding installation positions of valve core a or valve core b, allowing free movement. The bottom end of the cylinder is sealed, and the outer top end of the cylinder bottom can be a plane or a spherical surface that transitions to the conical arc of valve core a or valve core b. One or more throttling grooves are axially arranged on the circumference of the cylinder body. The throttling grooves are narrow and long through holes, arranged parallel or non-parallel axially. The small spring is installed on the outer circumference of the inner valve core cylinder body, with one end abutting against the outward-curving step and the other end abutting against valve core a or valve core b. Its function is to provide reset kinetic energy for the inner valve core. The valve core a is made of metal or nylon plastic and is cylindrical with a conical head. The outer diameter of the cylinder is clearance-fitted with the inner diameter of the valve tube, requiring valve core a to move freely in the valve tube, and the cylinder serves as a positioning element for valve core a in the valve tube. The cylinder has several refrigerant flow channels or several flow holes around its circumference. The flow channels are spirally arranged on the circumference of the cylinder, and their specific shape is not required, as long as they meet the flow cross-sectional requirements. The flow channels and flow holes can be set separately or in combination. The valve core a has a multi-step cylindrical hole at its center for installing the inner valve core, small spring, large spring, and valve core b. The central cylindrical hole at the top of the cone is a through hole that matches the inner valve core. The central cylindrical hole and the inner valve core are clearance-fitted. The inner valve core can move axially up and down within the central cylindrical hole, and the mating surfaces are sealed. The through hole is the liquid outlet. The inner valve core can move freely within the through hole and is sealed. The meshing angle between the cone of valve core a and the cone hole of the valve seat is β, which ranges from 30° to 90°. The cone surface of the cone a abuts against the cone surface of the valve seat cone hole. The valve core b is made of metal or nylon plastic and has a mushroom-shaped form, consisting of a conical cylinder bordering a slightly smaller diameter cylindrical body. The cylindrical body has several flow ports for refrigerant input; the shape of these ports is not specifically defined. The outer diameter of the cylindrical body is dynamically fitted with the larger diameter of the stepped hole in the valve core a. The valve core b has a stepped cylindrical hole at its center for installing the inner valve core, small spring, and large spring. The engagement angle between the conical head of the valve core b and the conical hole of the valve seat is β, ranging from 30° to 90°, with the conical surface of the conical head abutting against the conical surface of the valve seat hole.The large spring is a compression spring, which is installed in the inner cavity of valve core a and valve core b. Each end of the spring abuts against an inner valve core, which can stabilize the inner valve core. At the same time, it acts as a link to give the spring preload to valve core a and valve core b. When the refrigerant switches the flow direction at end A and end B, under the action of the large spring, valve core a and valve core b will produce a positive effect with flexible correlation change, which can alleviate the system fluctuation caused by the liquid direction switching and has a certain noise reduction effect.

[0005] Assembly: After securing the filter screen to the valve seat, press it into the designated position in the valve tube. Then, insert the small spring into the inner valve core and install valve core a and valve core b. Next, insert the large spring into the cylindrical body of valve core b, and then install it together with valve core a into the valve tube. Finally, press the filter screen into the valve seat to seal and fix it. After the overall assembly is completed, a valve seat cavity is formed at the valve seat, a valve core cavity is formed at the inner valve core, valve core a and valve core b enclose each other to form an inner flow cavity, and the valve tube, valve core a, and valve core b enclose each other to form an outer flow cavity.

[0006] Mechanism of action: When the pressure at end A is greater than that at end B, the refrigerant will pressurize valve core a and the inner valve core. The inner valve core will sink to a certain extent relative to valve core a, but this will not affect the locking of the inner valve core channel. Driven by the refrigerant pressure, valve core a and the inner valve core move downward together. At this time, the only path for the refrigerant is to push open valve core a from the valve seat cavity at end A, enter the outer flow cavity along the flow groove and flow hole on the circumference of valve core a, and then enter the inner flow cavity from the flow port. Due to the pressure difference between end A and end B, the refrigerant will pressurize valve core b and the inner valve core located at valve core b. Finally, the channel between valve core b and valve seat is blocked. The only path for the refrigerant is: from the valve seat cavity through the outer flow cavity, flow port, flow inner cavity, and valve core cavity at end b, and then push the inner valve core forward. The refrigerant flows out from the throttling groove of the inner valve core. During this process, the inner valve core will play a variable throttling role. Conversely, when the pressure at end B is greater than that at end A, the only path for the refrigerant is to push open valve core b from the valve seat cavity at end B, pass through the external flow cavity and the flow port to enter the internal flow cavity. Due to the pressure difference between end A and end B, the refrigerant will push the inner valve core at end a of the valve core forward and flow out from the throttling groove of the inner valve core. During this process, the inner valve core will play a variable throttling role. Attached Figure Description

[0007] Figure 1 A schematic diagram of the structural principle of this utility model.

[0008] Figure 2 Enlarged view of valve core a at position C.

[0009] Figure 3 Enlarged view of valve core b at position D.

[0010] Figure 4 Schematic diagram of valve core a.

[0011] Figure 5 ,for Figure 4 A bottom view.

[0012] Figure 6 Schematic diagram of valve core b.

[0013] Figure 7 Schematic diagram of the internal valve core structure.

[0014] Figure 8 Schematic diagram of valve seat structure.

[0015] K – Valve seat positioning groove.

[0016] β—the engagement angle between valve core a, valve core b and valve seat.

[0017] In the diagram: 1. Valve tube; 2. Valve seat; 3. Filter screen; 4. Small spring; 5. Inner valve core; 501. Throttling groove; 6. Large spring; 7. Valve core a; 8. Valve core b; 801. Flow port; 802. Liquid outlet; 101. Valve seat cavity; 102. Valve core cavity; 103. Flow inner cavity; 104. Flow outer cavity; Flow groove 105; Flow hole 106.

[0018] A. Above the position shown in the diagram; B. Below the position shown in the diagram; Detailed Implementation

[0019] An integrated bidirectional variable throttle valve comprises a valve tube 1, a valve seat 2, a filter screen 3, valve core component a, valve core component b, and a large spring 6. Valve core component a includes an inner valve core 5, a small spring 4, and a valve core a7; valve core component b includes an inner valve core 5, a small spring 4, and a valve core b8. The valve tube 1 is a circular tube and serves as the housing of this invention. All other components are installed inside the valve tube 1, which is made of metal. The valve seat 2 is cylindrical, with its outer diameter matching the inner diameter of the valve tube 1. The valve seat 2 is fixed to the valve tube 1, and its outer diameter has a positioning groove K for fixing it to the valve tube 1. The valve seat 2 has a central circular hole as a refrigerant channel, and the orifice has a conical opening matching the cone shape of valve core a7 or valve core b8. The valve seat 2 can be made of metal or high-strength nylon. The filter screen 3 is bowl-shaped or spherical, made of metal, and fixed to the valve seat 2. The inner valve core 5 is made of metal and is cylindrical in shape. The open end has an outward-curving step. The cylinder body and the outward-curving step are clearance-fitted at the corresponding installation positions of valve core a7 or valve core b8, allowing free movement. The bottom end of the cylinder is sealed, and the outer top end of the cylinder bottom can be a plane or a spherical surface that perfectly transitions to the arc of the conical head of valve core a7 or valve core b8. One or more throttling grooves 501 are axially arranged on the circumference of the cylinder body. The throttling grooves 501 are narrow, elongated through holes. The small spring 4 is installed on the outer circumference of the inner valve core 5 cylinder body, with one end abutting against the outward-curving step and the other end abutting against valve core a7 or valve core b8. Its function is to provide reset kinetic energy for the inner valve core 5. The valve core a7 is made of metal or nylon plastic and is cylindrical with a conical head. The outer diameter of the cylinder is clearance-fitted with the inner diameter of the valve tube 1, requiring that valve core a7 can move freely in the valve tube 1, and the cylinder serves as a positioning element for valve core a7 in the valve tube 1. The cylinder has several refrigerant flow channels 105 or several flow holes 106 around its circumference. The flow channels 105 are spirally arranged on the circumference of the cylinder. The specific shape is not required, as long as it meets the flow cross-sectional requirements. The flow channels 105 and flow holes 106 are set separately or in combination. The valve core a7 has a multi-step cylindrical hole at its center for installing the inner valve core 1, small spring 4, large spring 6, and valve core b8. The central cylindrical hole at the top of the cone is a through hole that matches the inner valve core 5. The central cylindrical hole and the inner valve core 5 are clearance-fitted. The inner valve core 5 can move axially up and down in the central cylindrical hole, and the mating surfaces are sealed. The through hole is the liquid outlet 802. The inner valve core 5 can move freely in the through hole and is sealed. The meshing angle between the cone of valve core a7 and the cone hole of valve seat 2 is β, which is between 30° and 90°. The cone surface of the cone a7 abuts against the cone surface of the cone hole of valve seat 2. The valve core b8 is made of metal or nylon plastic and has a mushroom-shaped appearance, that is, a cylinder with a conical head joined to a small-diameter cylindrical body. The cylindrical body has several flow ports 801 for refrigerant input. The shape of the flow ports 801 is not specifically limited. The outer diameter of the cylindrical body is dynamically matched with the large diameter of the stepped hole of the valve core a7. The valve core b8 has a stepped cylindrical hole at its center for installing the inner valve core 1, the small spring 4, and the large spring 6.The engagement angle β between the cone head of valve core b8 and the cone hole of valve seat 2 is between 30° and 90°, and the cone surface of the cone head abuts against the cone surface of the cone hole of valve seat 2. The large spring 6 is a compression spring, which is set in the inner cavity of valve core a7 and valve core b8, with each end abutting against an inner valve core 5. It can stabilize the inner valve core 5 and at the same time, it acts as a link to give the spring preload to valve core a7 and valve core b8. When the refrigerant switches the flow direction at end A and end B, under the action of the large spring 6, a positive effect with flexible correlation change will be generated between valve core a7 and valve core b8, which will alleviate the system fluctuation caused by the liquid direction switching and has a certain noise reduction effect.

[0020] Assembly: After securing the filter screen 3 to the valve seat 2, press it into the designated position on the valve tube 1. Then, insert the small spring 4 into the inner valve core 5, and then install valve core a7 and valve core b8. Next, insert the large spring 6 into the cylindrical body of valve core b8, and then install it together with valve core a7 into the valve tube 1. Finally, press the filter screen 3 into the valve seat 2 to seal and fix it. After the overall assembly is completed, a valve seat cavity 101 is formed at the valve seat 2, a valve core cavity 102 is formed at the inner valve core, valve core a7 and valve core b8 enclose each other to form a flow-through inner cavity 103, and the area enclosed by the valve tube 1, valve core a7, and valve core b8 forms a flow-through outer cavity 104.

[0021] Mechanism of action: When the pressure at end A is greater than that at end B, the refrigerant will apply pressure to valve core a7 and inner valve core 5. The inner valve core 5 will sink to a certain extent relative to valve core a7, but this will not affect the locking of the inner valve core 5 channel. Driven by the refrigerant pressure, valve core a7 moves downward along with the inner valve core 5. At this moment, the only path for the refrigerant is to push open valve core a7 from valve seat cavity 101 at end A, enter the outer flow cavity 104 along the flow groove 105 or flow hole 106 on the circumference of valve core a7, and then enter from the flow port 801. Upon entering the flow-through inner cavity 103, due to the pressure difference between end A and end B, the refrigerant will pressurize valve core b8 and the inner valve core 5 located at valve core b8. Ultimately, the passage between valve core b8 and valve seat 2 is blocked. The only path for the refrigerant is: from valve seat cavity 101 through flow-out cavity 104, flow port 801, flow-through inner cavity 103, and valve core cavity 101 at valve core b8 end, and then pushes the inner valve core 5 forward. The refrigerant flows out from the throttling groove 501 of the inner valve core 5. During this process, the inner valve core 5 will play a variable throttling role. Conversely, when the pressure at end B is greater than that at end A, the only path for the refrigerant is to push open the valve core b8 from the valve seat cavity 101 at end B, pass through the external flow cavity 104 and the flow port 801, and enter the internal flow cavity 103. Due to the pressure difference between end A and end B, the refrigerant will push the inner valve core 5 at the valve core a7 end to move forward and flow out from the throttling groove 501 of the inner valve core 5. During this process, the inner valve core 5 will play a variable throttling role.

Claims

1. An integrated bidirectional variable throttle valve, characterized in that: It consists of a valve tube, valve seat, filter screen, valve core component a, valve core component b, and large spring; valve core component a includes an inner valve core, a small spring, and valve core a; valve core component b includes an inner valve core, a small spring, and valve core b; the valve tube is a circular tube made of metal; the valve seat is cylindrical with an outer diameter matching the inner diameter of the valve tube, and the valve seat is fixed to the valve tube; the valve seat has a circular hole in the center as a refrigerant channel, and the orifice has a conical orifice matching the cone of valve core a or valve core b; the valve seat is made of metal or high-strength nylon; the filter screen is fixed to the valve seat and made of metal; on the belly of the valve tube, valve core component a and valve core component b are combined in reverse, and both ends are sealed by the valve seat and the valve tube, thus interconnecting the refrigerant channels and enabling them to mutually restrict the flow of refrigerant in both directions.

2. The integrated bidirectional variable throttle valve according to claim 1, characterized in that: The valve core a is shaped like a cylinder with a cone head. The outer diameter of the cylinder is in clearance fit with the inner diameter of the valve pipe. A refrigerant flow groove or flow hole is provided axially on the outer circumference of the valve core a. The flow groove is spirally arranged on the circumference of the cylinder to meet the flow cross-section requirements. A multi-step cylindrical hole is provided in the center of the valve core a for installing the inner valve core, small spring, large spring and valve core b. The cone head matches the cone surface of the valve seat cone hole. The cone angle β is in the range of 30~90°. The cone surface of the cone head abuts against the cone surface of the valve seat cone hole.

3. An integrated bidirectional variable throttle valve according to claim 1, characterized in that: The valve core b has a mushroom-shaped shape, that is, a cylindrical body with a cone head is adjacent to a small-diameter cylindrical body. The cylindrical body has several flow ports for refrigerant input. The shape of the flow ports is not specifically limited. The outer diameter of the cylindrical body is dynamically matched with the large-diameter section of the stepped hole of the valve core a. The valve core b has a multi-step cylindrical hole at its center. The top of the cone head matches the conical surface of the valve seat cone hole. The cone angle β is between 30 and 90°. The conical surface of the cone head abuts against the conical surface of the valve seat cone hole.

4. An integrated bidirectional variable throttle valve according to claim 1, characterized in that: The inner valve core is made of metal and is cylindrical in shape. The open end is provided with an outward step. The cylinder body and the outward step are fitted with a clearance fit at the corresponding installation position of valve core a or valve core b, and can move freely. The bottom end of the cylinder is sealed. The outer top end of the cylinder bottom can be a plane or a spherical surface that transitions to the arc of the conical head of valve core a or valve core b. One or more throttling grooves are provided axially around the cylinder body. The throttling grooves are narrow and long through holes, which are arranged parallel or non-parallel axially.

5. An integrated bidirectional variable throttle valve according to claim 1, characterized in that: The central cylindrical hole at the top of the cone of valve core a and valve core b is a through hole that matches the inner valve core. The central cylindrical hole and the inner valve core are in clearance fit. The inner valve core can move axially up and down within the central cylindrical hole, and the mating surfaces abut and seal.

6. An integrated bidirectional variable throttle valve according to claim 1, characterized in that: The large spring is a compression spring, which is installed in the inner cavity of valve core a and valve core b. Each end of the spring abuts against an inner valve core. When the refrigerant direction of the system is switched, it can reduce valve core fluctuation and stabilize the inner valve core.

7. An integrated bidirectional variable throttle valve according to claim 1, characterized in that: The valve cores a and b are made of metal or nylon plastic.

8. An integrated bidirectional variable throttle valve according to claim 1, characterized in that: The refrigerant flow channel is set on the outer circumference, and the flow groove and flow hole are set separately or in combination.

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