A valve needle structure of an electronic expansion valve that maintains a minute flow rate

Abstract

The utility model relates to the technical field of fluid control and regulation, particularly relate to a kind of valve needle structure of electronic expansion valve that keeps tiny flow, when using, staff adjusts the position of valve needle inside chamber A, to realize the adjustment of the size of the communicating section between chamber B and chamber A, realize the continuous provision tiny flow, with flow regulating function, with cut-off function when necessary;Including valve needle and valve base, the valve base inside is separately provided with chamber B and chamber A, the chamber B and chamber A are communicated, the chamber A inside can be fixed slidingly provided with valve needle, valve needle is used to adjust the size of the communicating section of chamber B and chamber A.

Description

Technical Field

[0001] This utility model relates to the technical field of fluid control and regulation, and in particular to a valve needle structure for an electronic expansion valve that maintains a small flow rate. Background Technology

[0002] Energy conservation and emission reduction are pressing issues for humanity. Throttling devices play a crucial role in refrigeration systems. By selecting a suitable throttling mechanism to match the refrigeration system, the energy consumption of the entire system can be reduced. The working principle of throttling is that when the refrigerant flows through the valve, the flow cross-section suddenly contracts, the fluid velocity increases, and the pressure decreases, thereby regulating the flow rate, controlling superheat, and regulating the evaporator level. Therefore, the flow regulation of the throttling mechanism plays a very important role in energy conservation and consumption reduction of refrigeration equipment. In situations with drastic load changes or a wide operating range, traditional throttling elements (such as capillary tubes and thermostatic expansion valves) can no longer meet the requirements for comfort and energy saving. The temperature sensing bulb of the thermostatic expansion valve has a significant delay characteristic, making it difficult to respond quickly and effectively to changes in flow rate in conjunction with the compressor displacement. This ultimately leads to oscillations in system regulation, causing unstable machine operation and even damage to the compressor network. Therefore, electronic expansion valves are gradually replacing traditional throttling elements. Electronic expansion valves are superior to traditional throttling mechanisms in superheat control (level control) and flow regulation, and they also have a faster response speed, a wider adjustment range, and more significant energy-saving effects, showing broad application prospects.

[0003] The heat exchange efficiency of a refrigerant system mainly depends on the pressure of the refrigerant at the high-pressure end of the system and the outlet temperature of the cooling device. The control of the refrigerant flow rate is usually determined according to the outlet temperature and pressure of the cooling device. The flow control is relatively complex. Generally, an electronic expansion valve is used to throttle and reduce the pressure of the refrigerant from the outlet of the cooling device, and the flow rate of the refrigerant sent from the cooling device to the evaporator is adjusted according to the temperature of the evaporator outlet or other temperature points that need to be adjusted, so as to adapt to the needs of the constantly changing cooling load.

[0004] However, due to the increasing complexity of operating conditions for vehicle systems, certain situations sometimes require the electronic expansion valve to continuously provide a small flow rate. Due to the special coordination between some components, situations may arise where the electronic expansion valve controller sends corresponding pulses, but the valve core assembly does not move, making it difficult to obtain the specific small flow rate. Some solutions involve opening holes in the valve seat or valve island to continuously provide flow, but these solutions cannot achieve the system's shut-off function, resulting in energy waste.

[0005] Therefore, to address the above problems, a valve needle solution is provided that enables the electronic expansion valve to continuously provide a small flow rate and has a shut-off function when necessary. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a valve needle structure for an electronic expansion valve that maintains a small flow rate.

[0007] This utility model discloses a valve needle structure for an electronic expansion valve that maintains a small flow rate. The valve needle includes a valve needle and a valve base. The valve base contains chambers B and A, which are connected. A valve needle is slidably mounted inside chamber A. The valve needle is used to adjust the size of the cross-section between chambers B and A. In use, the operator adjusts the position of the valve needle inside chamber A to adjust the size of the cross-section between chambers B and A, thereby continuously providing a small flow rate. It has a flow regulation function and, when necessary, a shut-off function.

[0008] Preferably, it also includes a sealing section and a flow maintenance section. The valve needle has a sealing section at its bottom end and a flow maintenance section at its bottom. When it is necessary to shut off chambers B and A, the operator lowers the valve needle in chamber A, so that the sealing section on the valve needle contacts the sealing surface of the valve base, thus shutting off the valve body. At this time, the medium in chamber B cannot flow into chamber A. When the valve needle is raised in chamber A, the flow maintenance section of the valve needle and the inner wall of chamber B on the valve base form a stable flow channel. The cross-sectional area of ​​the flow channel determines the flow rate of the medium. The gap d between the flow maintenance section on the valve needle and the valve base depends on the customer's input requirements. At this time, chamber B and chamber A are connected, and the valve body can continuously provide a small flow rate.

[0009] Preferably, it further includes a first flow regulating section and a second flow regulating section. The first flow regulating section is provided at the bottom of the flow maintaining section, and the second flow regulating section is provided at the bottom of the first flow regulating section. When the valve needle is continuously raised, the first and second flow regulating sections on the valve needle form flow channel cross-sectional areas of different sizes with the side wall of chamber B on the valve base. At this time, the flow rate of the medium passing through corresponds to the position of the valve needle. At this time, chamber B is connected to chamber A, and the valve body realizes the function of continuously regulating the flow rate.

[0010] Preferably, the sealing section is tapered, with the top diameter of the sealing section being the same as the diameter of the valve needle, and the bottom diameter of the sealing section being smaller than the top diameter.

[0011] Preferably, the flow maintenance section is a cylindrical section with a diameter that is connected to the bottom diameter of the sealing section.

[0012] Preferably, the first flow regulating section is a conical section, the top diameter of the first flow regulating section is the same as the diameter of the flow maintaining section, and the bottom diameter of the first flow regulating section is smaller than the top diameter of the first flow regulating section.

[0013] Preferably, the second flow regulating section is a conical section, with the top diameter of the second flow regulating section being the same as the bottom diameter of the first flow regulating section, and the bottom diameter of the second flow regulating section being smaller than the top diameter of the second flow regulating section.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: When in use, the operator adjusts the position of the valve needle inside chamber A, thereby adjusting the size of the cross-section between chamber B and chamber A, so as to continuously provide a small flow rate, with flow regulation function and shut-off function when necessary. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural schematic diagram of the present invention; Figure 2 This is a cross-sectional schematic diagram of the valve needle structure; Figure 3 This is a cross-sectional structural diagram of the valve base; Figure 4 yes Figure 3 A partially enlarged structural diagram of section A in the middle; Figure 5 This is a schematic diagram of the isometric structure of this utility model.

[0016] The following are labels in the attached diagram: 1. Valve needle; 2. Valve base; 3. Chamber B; 4. Chamber A; 1a. Sealing section; 1b. Flow maintenance section; 1c. Flow regulation section 1; 1d. Flow regulation section 2. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0018] Example like Figures 1 to 5 As shown, the valve needle structure of an electronic expansion valve for maintaining a small flow rate according to this utility model includes a valve needle 1 and a valve base 2. The valve base 2 is provided with a chamber B3 and a chamber A4 respectively. The chamber B3 and the chamber A4 are connected. The valve needle 1 is fixedly and slidably disposed inside the chamber A4. The valve needle 1 is used to adjust the size of the cross section between the chamber B3 and the chamber A4. It also includes a sealing section 1a and a flow maintenance section 1b. The valve needle 1 is provided with a sealing section 1a at its bottom end, and the sealing section 1a is provided with a flow maintenance section 1b at its bottom. It also includes a first flow regulation section 1c and a second flow regulation section 1d. The first flow regulation section 1c is provided at the bottom of the flow maintenance section 1b, and the second flow regulation section 1d is provided at the bottom of the first flow regulation section 1c. The sealing section 1a is tapered, with the top diameter of the sealing section 1a being the same as the diameter of the valve needle 1, and the bottom diameter of the sealing section 1a being smaller than the top diameter of the sealing section 1a. The flow maintenance section 1b is a cylindrical section whose diameter is connected to the bottom diameter of the sealing section 1a; The first flow regulating section 1c is tapered, and the top diameter of the first flow regulating section 1c is the same as the diameter of the flow maintaining section 1b. The bottom diameter of the first flow regulating section 1c is smaller than the top diameter of the first flow regulating section 1c. The second flow regulating section 1d is a conical section. The top diameter of the second flow regulating section 1d is the same as the bottom diameter of the first flow regulating section 1c. The bottom diameter of the second flow regulating section 1d is smaller than the top diameter of the second flow regulating section 1d.

[0019] In this embodiment, when it is necessary to shut off chambers B3 and A4, the operator lowers valve needle 1 in chamber A4, causing the sealing section 1a on valve needle 1 to contact the sealing surface of valve base 2, thus shutting off the valve body. At this time, the medium in chamber B3 cannot flow into chamber A4. When valve needle 1 is raised in chamber A4, the flow maintenance section 1b of valve needle 1 forms a stable flow channel with the inner wall of chamber B3 on valve base 2. The cross-sectional area of ​​the flow channel determines the flow rate of the medium passing through it. The gap d between the flow maintenance section 1b and the valve base 2 depends on the customer's input requirements. At this time, the chamber B3 is connected to the chamber A4, and the valve body realizes the function of continuously providing a small flow. When the valve needle 1 is continuously raised, the first flow regulating section 1c and the second flow regulating section 1d on the valve needle 1 form flow channel cross-sectional areas of different sizes with the side wall of the chamber B3 on the valve base 2. At this time, the flow rate of the medium passing through is related to the position of the valve needle 1. At this time, the chamber B3 is connected to the chamber A4, and the valve body realizes the function of continuously regulating the flow.

[0020] The main functions achieved by this utility model are: 1. Valve needle 1 has a flow maintenance section 1b; 2. The flow maintenance section 1b of valve needle 1 forms a stable flow channel with the valve base; 3. The gap d between the flow maintenance section 1b of valve needle 1 and the valve base depends on the customer's input requirements and can be adjusted accordingly.

[0021] The valve base 2 of the valve needle structure of the electronic expansion valve for maintaining a small flow rate of this utility model is commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A valve needle structure for an electronic expansion valve that maintains a small flow rate, characterized in that, It includes a valve needle (1) and a valve base (2). The valve base (2) is provided with a chamber B (3) and a chamber A (4) respectively. The chamber B (3) and the chamber A (4) are connected. The valve needle (1) is fixedly and slidably arranged inside the chamber A (4). The valve needle (1) is used to adjust the size of the cross section of the chamber B (3) and the chamber A (4).

2. The valve needle structure of an electronic expansion valve for maintaining a small flow rate as described in claim 1, characterized in that, It also includes a sealing section (1a) and a flow maintenance section (1b), wherein the valve needle (1) is provided with a sealing section (1a) at its bottom end and a flow maintenance section (1b) is provided at the bottom of the sealing section (1a).

3. The valve needle structure of an electronic expansion valve for maintaining a small flow rate as described in claim 2, characterized in that, It also includes a first flow regulation section (1c) and a second flow regulation section (1d). The first flow regulation section (1c) is provided at the bottom of the flow maintenance section (1b), and the second flow regulation section (1d) is provided at the bottom of the first flow regulation section (1c).

4. The valve needle structure of an electronic expansion valve for maintaining a small flow rate as described in claim 2, characterized in that, The sealing section (1a) is tapered, with the top diameter of the sealing section (1a) being the same as the diameter of the valve needle (1), and the bottom diameter of the sealing section (1a) being smaller than the top diameter of the sealing section (1a).

5. The valve needle structure of an electronic expansion valve for maintaining a small flow rate as described in claim 2, characterized in that, The flow maintenance section (1b) is a cylindrical section whose diameter is connected to the bottom diameter of the sealing section (1a).

6. The valve needle structure of an electronic expansion valve for maintaining a small flow rate as described in claim 3, characterized in that, The first flow regulating section (1c) is a conical section. The top diameter of the first flow regulating section (1c) is the same as the diameter of the flow maintaining section (1b), and the bottom diameter of the first flow regulating section (1c) is smaller than the top diameter of the first flow regulating section (1c).

7. The valve needle structure of an electronic expansion valve for maintaining a small flow rate as described in claim 3, characterized in that, The second flow regulating section (1d) is a conical section. The top diameter of the second flow regulating section (1d) is the same as the bottom diameter of the first flow regulating section (1c). The bottom diameter of the second flow regulating section (1d) is smaller than the top diameter of the second flow regulating section (1d).

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