An integrated bidirectional variable restriction device

Abstract

An integrated bidirectional variable throttling device is composed of a valve pipe, a valve seat, a valve core, a filter screen, a valve core receiving pipe, a valve needle seat, a spring and a valve needle. When one end channel is opened, the other end channel will be closed, otherwise the throttling accuracy will be affected. The arrow is a schematic diagram of the refrigerant path. When the input end valve core moves to the valve seat overflow groove to the maximum flow-through position, the output end valve core stop shoulder will play a limiting role. The refrigerant passes through the inner cavity of the valve core receiving pipe, the output end valve needle seat moves forward under the refrigerant pressure, and then pushes away the valve needle cone head. The amount of refrigerant flowing out will depend on the pressure of the refrigerant and the size of the valve needle stroke. The device can be arranged symmetrically, or it can be mixed with other structure types of valve core. If the full symmetrical layout is adopted, the valve seat, valve core, filter screen, valve needle seat, spring and valve needle parts with the same structure can be mirror image combined, which can reduce the number of part varieties, simplify the production process and reduce the production cost.

Description

Technical Field

[0001] This utility model relates to an integrated bidirectional variable throttling device in the field of air conditioning technology. Background Technology

[0002] Existing bidirectional throttling valves come in a wide variety of types, typically employing two throttling valve assemblies connected in parallel or series to achieve bidirectional refrigerant flow while regulating refrigerant flow. These types of bidirectional throttling valves suffer from drawbacks such as large size, high material consumption, and high manufacturing costs. While some bidirectional throttling valves utilize a single valve-pipe integrated design, although they offer the ability to switch refrigerant flow in both directions, they often cannot meet the requirement of achieving a wide range of bidirectional refrigerant flow regulation. Summary of the Invention

[0003] The integrated bidirectional variable throttling device provided by this utility model is designed by constructing a variable throttling one-way channel opposite to the original flow direction on the belly of the one-way valve core. Two variable throttling one-way channels with essentially the same function are combined in reverse to form a throttling valve device with mutually restrictive forward and reverse functions. This utility model also has the advantages of small size, simple structure, easy processing, and low manufacturing cost.

[0004] This invention is implemented as follows: it consists of a valve tube, a valve seat, a valve core, a filter screen, a valve core receiving tube, a valve needle seat, a spring, and a valve needle. The valve tube is a circular tube, which serves as the housing of this invention, and is made of metal. The valve seat can be made of metal or high-strength nylon, and is cylindrical in shape. Its outer diameter matches the inner diameter of the valve tube, and the valve seat is fixed to the valve tube. A positioning groove is provided on the outer diameter to be fixed to the valve tube. A circular hole matching the valve core is located at the center of the valve seat, allowing the valve core to move freely within the valve seat. Several flow grooves are radially arranged on the valve seat hole wall, each with a single-sided end cap. The length of these flow grooves will allow for the left and right refrigerant flow to be controlled by the valve core's stroke. Specifically, when the high-pressure end valve core moves to the inlet position of the flow groove, the low-pressure end valve core enters the closed position of the flow groove. The high-pressure end refrigerant flows through the flow hole from the valve core receiving tube to the low-pressure end, pushing the valve needle seat forward and opening the valve needle cone. The refrigerant is then output through the outlet flow hole. The same applies when the system reverses direction. This interlocking function is a reliable guarantee for achieving bidirectional variable conduction. The valve core is cylindrical in shape and made of metal. The opening has a flanged shoulder for stroke limiting. Inside the cylinder are stepped holes for installing the valve needle seat, valve needle, spring, and valve core receiving tube. The bottom of the cylinder has a tapered hole that meshes with the conical surface of the valve needle. The valve core receiving tube is a metal cylindrical tube with a positioning shaft at its outer diameter. Both ends of the shaft are fixed to the inner diameter of the valve core, and the middle section has several flow holes. The valve needle seat is also cylindrical in shape and made of metal. The opening end has an outward-curved step, and the outer circumference of the outward-curved step is clearance-fitted with the valve core hole. The cylinder body and the outward-curved step can move freely at the corresponding installation position of the valve core. A threaded hole matching the valve needle thread is located at the center of the bottom of the cylinder, and several refrigerant outlet flow holes are arranged around the axis. The spring is installed on the outer circumference of the valve needle seat cylinder body, with one end abutting against the outward-curved step and the other end abutting against the valve core. Its function is to resist and balance the refrigerant input pressure and provide reset kinetic energy for the output valve needle. The filter screen is bowl-shaped or spherical, made of metal, and fixed to the valve seat. The valve needle is made of metal and is a rod-shaped component with an inverted cone at one end and external threads at the other end. The cone angle of the inverted cone matches the cone angle of the cone hole at the bottom of the valve core cylinder, and the external threads match the threaded hole of the valve needle seat.

[0005] This utility model can be arranged in a fully symmetrical layout or mixed with other types of valve cores. If a fully symmetrical layout is adopted, valve seats, valve cores, filters, valve needle seats, springs, and valve needles with identical structures can be mirrored and combined. This can reduce the number of parts, simplify the production process, and reduce production costs.

[0006] Assembly: After placing the spring on the valve needle seat, install the valve needle seat into the valve core. Then, secure the two identical assemblies to both ends of the valve core receiving tube. Next, secure one valve seat inside the valve tube, then install the assembled spring, valve core, and valve core receiving tube assembly into the valve seat inside the valve tube. Finally, attach and secure the other valve seat. After completing the above steps, the device can be sent to the performance testing station. Apply a small amount of slowly curing gel to the valve needle threads and screw it into the valve needle seat threaded hole. Then, perform the test at the testing station. During the test, rotating the valve needle adjusts the distance the needle moves in and out to correct the test data. Once the data meets the standards, remove the device from the testing station and allow the gel to cure.

[0007] Mechanism of Operation: In an air conditioning system, the high-pressure and low-pressure ends of the refrigerant are constantly switching. When the refrigerant on the high-pressure end pushes open the valve core to the valve seat's flow groove, the two valve cores in this invention are rigidly connected via a valve core bearing pipe, meaning their movements are synchronized. The design requires that when the flow groove on the input valve seat is open, the flow groove on the output valve seat should be closed. If the flow groove on the output end is not completely closed, some refrigerant will flow out of the valve seat without passing through the valve needle hole, inevitably affecting the control of throttling accuracy. Therefore, in principle, when one channel is opened, the other channel should be closed. The arrow shows a schematic diagram of the refrigerant flow path. When the input valve core moves to the maximum flow position in the valve seat groove, the valve core shoulder on the output end will act as a limit stop. The refrigerant reaches the inner cavity of the valve core receiving tube through the flow hole. Under the action of the refrigerant pressure, the valve needle seat at the output end moves forward, thereby pushing open the valve needle cone. The refrigerant then flows out through the valve core cone hole. The amount of refrigerant flowing out depends on the refrigerant pressure and the size of the valve needle opening stroke. Attached Figure Description

[0008] Figure 1 The overall structure and principle diagram of this utility model.

[0009] Figure 2 Axial sectional view of the valve seat.

[0010] Figure 3 for Figure 2 Left view.

[0011] Figure 4 for Figure 2 Sectional view of section AA.

[0012] Figure 5 This is a schematic diagram of the valve core structure.

[0013] Figure 6 This is a schematic diagram of the valve needle seat structure.

[0014] Figure 7 This is a schematic diagram of the valve core support pipe.

[0015] Figure 8This is a schematic diagram of the valve needle structure.

[0016] β – The cone angle of the valve core cone hole and the valve needle cone.

[0017] In the diagram: 1. Valve tube; 2. Valve seat; 3. Valve core; 4. Filter screen; 5. Valve core receiving tube; 6. Valve needle seat; 7. Spring; 8. Valve needle; 01. Liquid outlet orifice; 02. Flow orifice; 03. Positioning groove; 04. Flow groove. Detailed Implementation

[0018] An integrated bidirectional variable throttling device is provided, which consists of a valve tube 1, a valve seat 2, a valve core 3, a filter screen 4, a valve core receiving tube 5, a valve needle seat 6, a spring 7, and a valve needle 8; the valve tube 1 is a circular tube and serves as the housing of this utility model, and the valve tube 1 is made of metal material. The valve seat 2 can be made of metal or high-strength nylon material, and is cylindrical in shape. Its outer diameter matches the inner diameter of the valve pipe 1. The valve seat 2 is fixed to the valve pipe 1, and a positioning groove 03 is provided on its outer diameter to be fixed to the valve pipe 1. The center of the valve seat 2 has a circular hole that matches the valve core 3. The valve core 3 can move freely in the valve seat 2. Several flow grooves 04 are radially arranged on the wall of the valve seat 2 hole. The flow grooves 04 are single-sided sealed, and their physical length will meet the change of the valve core 3 stroke to open and close the refrigerant flow. That is, when the high-pressure end valve core 3 moves to the liquid inlet position of the flow groove 04, the low-pressure end valve core 3 enters the closed position of the flow groove 04. The high-pressure end refrigerant flows from the valve core receiving pipe 5 through the flow hole 02 to the low-pressure end, and pushes the valve needle seat 6 forward, thereby opening the valve needle 8 cone. The refrigerant is output through the liquid outlet flow hole 01. The same applies when the system reverses direction. The interlocking function set here is a reliable guarantee for the realization of bidirectional variable conduction. The valve core 3 is cylindrical in shape and made of metal. The opening of the cylinder has a flanged shoulder for stroke limiting. Inside the cylinder are stepped holes for installing the valve needle seat 6, valve needle 8, spring 7, and valve core receiving tube 5. The bottom of the cylinder has a tapered hole that meshes with the conical surface of the valve needle 8. The valve core receiving tube 5 is a metal cylindrical tube with a positioning shaft at its outer diameter. Both ends of the shaft are fixed to the inner diameter of the valve core 3, and the middle section has several flow holes 02. The valve needle seat 6 is made of metal and is cylindrical in shape. The opening end has an outward-curved step, and the outer circumference of the outward-curved step is clearance-fitted with the hole in the valve core 3. The cylinder body and the outward-curved step can move freely at the corresponding installation position of the valve core 3. The center of the bottom end of the cylinder has a threaded hole that matches the thread of the valve needle 8, and several refrigerant outlet flow holes 01 are arranged around the axis. The spring 7 is installed on the outer periphery of the valve needle seat 6 cylinder, with one end abutting against the outward-facing step and the other end abutting against the valve core 3. Its function is to resist and balance the pressure at the refrigerant input end and provide reset kinetic energy for the output valve needle 8. The filter screen 4 is bowl-shaped or spherical, made of metal, and is fixed to the valve seat 2. The valve needle 8 is made of metal and is a rod-shaped component with an inverted cone head at one end and an external thread at the other end. The cone angle β of the inverted cone head matches the cone angle β of the cone hole at the bottom of the valve core cylinder, and the external thread matches the threaded hole of the valve needle seat 6.

[0019] This utility model can be arranged in a fully symmetrical layout or mixed with other types of valve cores. If a fully symmetrical layout is adopted, the valve seat 2, valve core 3, filter screen 4, valve needle seat 6, spring 7, and valve needle 8, which have the same structure, can be mirrored and combined. This can reduce the number of parts, simplify the production process, and reduce production costs.

[0020] Assembly: Place the spring sleeve 7 onto the valve needle seat 6, then insert the valve needle seat 6 into the valve core 3. Next, secure the two identical assemblies to both ends of the valve core receiving tube 5. Then, secure one valve seat 2 inside the valve tube 1. Next, insert the assembled spring 7, valve core 3, and valve core receiving tube 5 into the valve seat 2 inside the valve tube 1, and then fasten and secure the other valve seat 2. After completing the above steps, the valve can be sent to the performance testing station. Apply a small amount of slowly curing gel to the threads of the valve needle 8 and screw it into the threaded hole of the valve needle seat 6. Then, perform measurements at the testing station. During testing, rotating the valve needle 8 adjusts the distance it travels in and out to correct the test data. Once the data meets the standards, remove the valve from the testing station and allow the gel to cure.

[0021] Mechanism of Operation: In an air conditioning system, the high-pressure and low-pressure ends of the refrigerant are constantly switching. When the refrigerant on the high-pressure end pushes open the valve core 3 to the flow groove 04 of the valve seat 2, the two valve cores 3 in this invention are rigidly connected by the valve core receiving pipe 5, meaning their movements are synchronized. The design requires that when the flow groove 04 of the input valve seat 2 is open, the flow groove 04 of the output valve seat 2 should be in a closed position. If the flow groove 04 of the output valve seat 2 is not completely closed, some refrigerant will flow out of the valve seat 2 without passing through the valve needle 8 hole, which will inevitably affect the control of throttling accuracy. Therefore, in principle, when one end of the channel is opened, the other end should be closed. The arrow shows a schematic diagram of the refrigerant flow path. When the input valve core 3 moves to the maximum flow position in the flow groove 04 of the valve seat 2, the shoulder of the output valve core 3 will act as a limit. The refrigerant reaches the inner cavity of the valve core receiving pipe 5 through the flow hole 02. The valve needle seat 6 at the output end moves forward under the action of refrigerant pressure, thereby pushing open the cone head of the valve needle 8. The refrigerant then flows out through the cone hole of the valve core 3. The amount of refrigerant flowing out depends on the refrigerant pressure and the size of the stroke of the valve needle 8.

Claims

1. An integrated bidirectional variable throttling device, comprising a valve tube, valve seat, valve core, filter screen, valve core receiving tube, valve needle seat, spring, and valve needle; wherein the valve tube is circular and made of metal; the valve seat is cylindrical with an outer diameter matching the inner diameter of the valve tube, the valve seat is fixed to the valve tube, and a positioning groove is provided on the outer diameter to be fixed to the valve tube; a circular hole matching the valve core is provided at the center of the valve seat, the valve core can move freely in the valve seat, and several flow grooves are radially provided on the wall of the valve seat hole, each flow groove having a single-sided end cap, the length of which satisfies the change in valve core stroke to control the flow of refrigerant on the left and right sides, i.e. when the high-pressure end valve core moves to the liquid inlet position of the flow groove, the low-pressure end valve core enters the closed position of the flow groove, and the high-pressure end refrigerant flows from the valve core receiving tube to the low-pressure end through the flow hole, pushing the valve needle seat forward, thereby opening the valve needle cone, and the refrigerant is output through the liquid outlet flow hole, and the same applies when the system reverses direction.

2. The integrated bidirectional variable throttling device according to claim 1, characterized in that: The valve core is cylindrical in shape and made of metal. The opening of the cylinder is provided with a flanged shoulder for limiting the stroke. The inside of the cylinder is provided with a stepped hole for installing the valve needle seat, valve needle, spring and valve core receiving tube. The bottom of the cylinder is provided with a conical hole that meshes with the conical surface of the valve needle cone.

3. The integrated bidirectional variable throttling device according to claim 1, characterized in that: The valve core receiving tube is a metal round tube with a positioning shaft on its outer diameter. The two ends of the shaft are fixed to the inner diameter of the valve core, and the middle section is provided with several flow holes.

4. The integrated bidirectional variable throttling device according to claim 1, characterized in that: The valve needle seat is made of metal and has a cylindrical shape. The open end is provided with an outward step, and the outer circumference of the outward step is in clearance fit with the valve core hole. The cylinder body and the outward step can move freely in the corresponding installation position of the valve core. The bottom end of the cylinder is provided with a threaded hole that matches the valve needle thread, and several refrigerant outlet holes are provided around the axis.

5. The integrated bidirectional variable throttling device according to claim 1, characterized in that: The spring is installed on the outer periphery of the valve needle seat, with one end abutting against the outward-facing step and the other end abutting against the valve core, in order to resist and balance the pressure at the refrigerant input end and provide reset kinetic energy for the valve needle at the output end.

6. The integrated bidirectional variable throttling device according to claim 1, characterized in that: The valve needle is made of metal and is a rod-shaped component with an inverted cone at one end and an external thread at the other end. The cone angle of the inverted cone matches the cone angle of the cone hole at the bottom of the valve core cylinder, and the external thread matches the screw hole of the valve needle seat.

7. The integrated bidirectional variable throttling device according to claim 1, characterized in that: The valve seat may be made of metal or high-strength nylon material.

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