Liquid storage type thermostatic expansion valve and refrigeration equipment

Abstract

The invention provides a liquid storage type thermostatic expansion valve and refrigeration equipment, relates to the field of refrigeration equipment, and aims to solve the problem that the timeliness of response to working condition change and the accuracy of refrigerant flow regulation of a refrigeration system are influenced due to the fact that the opening degree of a valve element of an existing thermostatic expansion valve is delayed due to heat transfer loss. The refrigerant storage box for controlling the throttling assembly to adjust receives the effect of the circulating medium in the containing cavity, when the working condition of the refrigerating system changes, the states such as the temperature and the pressure of the circulating medium can be changed to enable the refrigerant storage box to deform, then the stroke piston is driven to move, and the circulating medium can be temporarily stored in the containing cavity; therefore, the refrigerant storage box has larger heat exchange contact area and longer heat exchange time with the circulating medium, the heat transfer efficiency between the refrigerant storage box and the refrigerating system is enhanced, and the response speed is increased.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to a liquid storage type thermal expansion valve and refrigeration equipment. Background Art

[0002] In the field of refrigeration technology, there are many problems with the throttling elements of traditional refrigeration systems. Although the capillary throttling technology has a simple structure and low cost, it has the serious defect that the system flow cannot be adjusted. In practical applications, as the refrigeration conditions continue to change, the refrigerant flow required by the system also needs to be adjusted accordingly. However, due to its own fixed throttling characteristics, the capillary throttling cannot meet this dynamic demand, making it difficult for the refrigeration system to maintain a stable and efficient operating state, greatly affecting the refrigeration effect. For example, in some small commercial refrigerators, when the ambient temperature fluctuates greatly or the storage volume changes significantly, the capillary throttling cannot adjust the flow, which is prone to insufficient or excessive refrigeration, which not only wastes energy, but may also affect the quality of the stored items.

[0003] A thermal expansion valve is disclosed in a Chinese patent (publication number CN222504430U, publication date 20250218). The transfer rod valve needle assembly consists of a transfer rod, a valve needle, and a sealing ring. The refrigerant temperature at the evaporator outlet is sensed by a thermal head, and the refrigerant flow is adjusted by controlling the valve needle movement through pressure transmission. However, in this process, heat transfer loss is inevitable, which leads to a delay in the valve core opening. This delay makes the refrigeration system slow to respond to changes in operating conditions, and it is impossible to adjust the refrigerant flow in a timely and accurate manner, which ultimately leads to a significant reduction in the refrigeration effect. In refrigeration equipment, when the ambient temperature changes rapidly, the response gear ring of the traditional thermal expansion valve will cause a significant lag in temperature regulation, affecting the operation of the refrigeration equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a liquid storage type thermal expansion valve and refrigeration equipment in response to the defects of the prior art. A housing is used to establish a cavity, and a refrigerant storage box controlled by a throttling component is subjected to the action of a circulating medium in the cavity. When the operating condition of the refrigeration system changes, changes in the temperature, pressure and other states of the circulating medium in the refrigerant storage box will cause the refrigerant storage box to deform, thereby driving the stroke piston to move. The cavity can temporarily store the circulating medium, so that the refrigerant storage box has a larger heat exchange contact area and heat exchange time with the circulating medium, which helps to enhance the heat transfer efficiency between the refrigerant storage box and the circulating medium of the refrigeration system, thereby improving the response speed. In addition, the circulating medium in the cavity can also play a buffering role and can maintain a relatively stable state for a short time, thereby providing a relatively stable sensing basis for the refrigerant storage box and improving the adjustment accuracy.

[0005] The first object of the present invention is to provide a liquid storage type thermal expansion valve, which adopts the following scheme:

[0006] include:

[0007] The shell has a cavity formed inside, and the cavity is connected between the liquid outlet pipe and the air return pipe of the evaporator of the refrigeration system;

[0008] The valve body includes a throttling assembly and a throttling tube passing through the cavity. The throttling tube is provided with a throttling channel and a mounting hole for cutting off the throttling channel. The throttling assembly includes a fixing part, a stroke piston and a refrigerant storage box. The deformation surface of the refrigerant storage box is connected to the stroke piston after passing through the fixing part through a pull rod. The stroke piston is slidably matched with the mounting hole and is matched with an elastic part. The fixing part is installed in the mounting hole. A throttling gap is formed between the fixing part and the end face of the stroke piston to connect the throttling channels on both sides of the cut-off point. The refrigerant storage box extends into the cavity to receive the action of the circulating medium.

[0009] Furthermore, the shell is provided with a first interface and a second interface communicating with the cavity, and the first interface and the second interface are located on different sides of the axis of the throttling tube and are arranged in a staggered manner.

[0010] Furthermore, the shell includes a first shell and a second shell that are interlocked with each other, and the intersection position of the throttle tube and the shell is sealed and fixed.

[0011] Furthermore, joints are provided at both ends of the throttling tube, and the throttling channel inside the throttling tube is in a spiral shape.

[0012] Furthermore, the mounting hole is opened on the side wall of the throttle tube, the stroke piston and the fixing part are arranged in sequence along the axial direction of the mounting hole, one side of the throttling gap is connected to the throttling channel segment on one side of the mounting hole, and the other side of the throttling gap is connected to the throttling channel segment on the other side of the mounting hole, so that the inside of the throttling tube is connected.

[0013] Furthermore, an end of the stroke piston away from the throttling gap is in contact with an elastic member, and the extension and contraction direction of the elastic member, the sliding direction of the stroke piston, and the moving direction of the pull rod driven by the refrigerant storage box are parallel or collinear.

[0014] Furthermore, the refrigerant storage box is installed on the fixing member, the refrigerant storage cover of the refrigerant storage box is a deformation surface, and the refrigerant storage cover is connected to the pull rod through a pad so as to drive the pull rod to adjust the throttling gap through deformation.

[0015] Furthermore, the fixing member blocks the mounting hole, and the refrigerant storage box is located outside the mounting hole.

[0016] The second object of the present invention is to provide a refrigeration device using the accumulator-type thermal expansion valve as described in the first object.

[0017] Furthermore, the refrigeration device includes a refrigeration system. One side of the cavity of the liquid storage thermostatic expansion valve is connected to the liquid outlet pipe of the evaporator, and the other side is connected to the suction pipe. One end of the throttle pipe is connected to the liquid outlet pipe of the condenser of the refrigeration system, and the other end of the throttle pipe is connected to the liquid inlet pipe of the evaporator of the refrigeration system.

[0018] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0019] Aiming at the problem that the opening of the valve core of the current thermostatic expansion valve is delayed due to heat transfer loss, which in turn affects the timeliness of the refrigeration system's response to working condition changes and the accuracy of refrigerant flow regulation, a cavity is established using the housing, and the refrigerant storage box that controls the throttle assembly is placed in the cavity to receive the action of the circulating medium. When the working conditions of the refrigeration system change, the change in the state of the circulating medium such as temperature and pressure will cause the refrigerant storage box to deform, thereby driving the stroke piston to move. The cavity can temporarily store the circulating medium, so that the refrigerant storage box has a larger heat exchange contact area and heat exchange time with the circulating medium, which helps to enhance the heat transfer efficiency between the refrigerant storage box and the refrigeration system, thereby improving the response speed. In addition, the circulating medium in the cavity can also play a buffering role and can maintain a relatively stable state in a short time, thereby providing a relatively stable induction basis for the refrigerant storage box and improving the regulation accuracy.

[0020] The first interface and the second interface that communicate with the cavity and are arranged on different sides of the axis of the throttle pipe and are arranged in a staggered manner solve the problems of the flow uniformity and stability of the refrigerant entering and leaving the cavity, and can make the refrigerant form a more reasonable flow path in the cavity, avoiding pressure fluctuations and energy losses caused by problems such as direct impact of the refrigerant or too fast local flow velocity, which helps to improve the heat exchange efficiency between the refrigerant and the refrigerant storage box, further enhancing the stability and reliability of the expansion valve's regulation of the refrigerant flow and making the refrigeration system operate more smoothly.

[0021] The elastic member provides stable support and a reset force for the stroke piston, enabling it to quickly and accurately return to the initial position or adjust to a suitable position after being driven by the refrigerant storage box, ensuring the accuracy of the next flow regulation. The parallel or collinear direction setting ensures uniform force on each component during movement, reducing friction and energy loss between components, and improving the response speed and regulation accuracy of the expansion valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The specification drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0023] Figure 1 It is a schematic external structure diagram of the liquid storage thermostatic expansion valve in one or more embodiments of the present invention.

[0024] Figure 2 This is a schematic diagram of the internal structure of a liquid storage type thermostatic expansion valve in one or more embodiments of the present invention.

[0025] Figure 3 This is a schematic diagram of the inside of the valve body in one or more embodiments of the present invention.

[0026] Figure 4 is Figure 3 a partial enlarged view of location A in

[0027] Figure 5 This is an exploded view of a liquid storage type thermostatic expansion valve in one or more embodiments of the present invention.

[0028] Wherein, 1, the first housing; 2, the second housing; 3, the valve body; 4, the elastic member; 5, the stroke piston; 6, the pull rod; 7, the fixing member; 8, the cushion block; 9, the refrigerant storage cover; 10, the refrigerant storage box; 11, the plug; 122, the second interface; 123, the first interface; 331, the first joint; 332, the second joint; 421, the throttling channel; 422, the throttling gap; 521, the bottom surface of the piston; 522, the top surface of the fixing member. Detailed implementation manners

[0029] Embodiment 1

[0030] In a typical embodiment of the present invention, as Figures 1 - 5 shown, a liquid storage type thermostatic expansion valve is provided.

[0031] In a traditional thermostatic expansion valve, there is a lack of an effective buffering and centralized action space for the circulating medium in the system, making it difficult for the refrigerant storage box 10 to respond quickly and stably to changes in working conditions. Based on this, in this embodiment, a liquid storage type thermostatic expansion valve is provided. By arranging a cavity inside the housing that connects the liquid outlet pipe and the return air pipe of the evaporator, and arranging the refrigerant storage box 10 that triggers the adjustment of the throttling gap 422 in the cavity, the problems of unstable refrigeration medium environment and low heat transfer efficiency around the refrigerant storage box 10 are solved. Thereby, the response speed of the refrigerant storage box 10 to changes in working conditions is improved, and the accuracy of adjustment is enhanced.

[0032] As Figure 1 and Figure 2 shown, the cavity can temporarily store the circulating medium, increasing the heat exchange contact area and heat exchange time between the refrigerant storage box 10 and the circulating medium, significantly enhancing the heat transfer efficiency, and accelerating the response speed of the refrigerant storage box 10 to changes in working conditions. At the same time, the circulating medium in the cavity plays a buffering role, providing a stable sensing basis for the refrigerant storage box 10, improving the accuracy of adjustment, enabling the expansion valve to better adapt to the dynamic changes of the refrigeration system, and maintaining stable refrigeration performance.

[0033] As Figure 5As shown in the figure, the liquid storage type thermal expansion valve mainly includes a housing and a valve body 3. A cavity is formed inside the housing, which can temporarily store the circulating medium and also serve as a passage for the circulating medium to pass through. The valve body 3 can achieve throttling adjustment under the action of the circulating medium in the cavity.

[0034] For the adjustment process of the refrigerant flow rate that cannot be flexibly and accurately controlled by the traditional structure, it is difficult to meet the flow rate requirements under different working conditions. In this embodiment, the valve body 3 includes a throttling component and a throttling tube passing through the cavity. A throttling channel 421 and a mounting hole for truncating the throttling channel 421 are provided in the throttling tube. The throttling component includes a fixing member 7, a stroke piston 5, and a refrigerant storage box 10. The deformation surface of the refrigerant storage box 10 is connected to the stroke piston 5 through a pull rod 6 after passing through the fixing member 7. The stroke piston 5 is slidably matched with the mounting hole and is provided with an elastic member 4. The fixing member 7 is installed in the mounting hole, and a throttling gap 422 communicating with the throttling channels 421 on both sides of the truncation is formed between the end surfaces of the fixing member 7 and the stroke piston 5. The refrigerant storage box 10 extends into the cavity to receive the action of the circulating medium.

[0035] By using a throttling tube with a throttling channel 421 and a mounting hole, and forming a throttling gap 422 in cooperation with the stroke piston 5 at the mounting hole, the problems of inflexible and inaccurate flow rate adjustment are solved. Through the sliding fit between the stroke piston 5 and the mounting hole and the setting of the throttling gap 422, the movement of the stroke piston 5 can be driven according to the deformation of the refrigerant storage box 10, and the size of the throttling gap 422 can be accurately adjusted, so as to realize the precise control of the flow rate of circulating media such as refrigerant, ensure that the refrigeration system can obtain an appropriate flow rate of circulating medium under various working conditions, and improve the refrigeration efficiency and stability.

[0036] During the flow rate adjustment process, it is necessary to ensure the stable cooperation between components and the reliability of actions, and at the same time, the reset and adaptive adjustment capabilities of components should be considered. The installation of the fixing member 7 in the mounting hole ensures the structural stability, and the cooperation between the stroke piston 5 and the elastic member 4 solves the problems of the reliability of component actions and reset. The stroke piston 5 can be reset in time after being driven to move by the refrigerant storage box 10 under the action of the elastic member 4, and maintain good adjustment performance under different working conditions. The elastic member 4 can also buffer the movement of the stroke piston 5 to a certain extent, avoid damage to components caused by sudden pressure changes and other situations, and improve the service life and reliability of the expansion valve.

[0037] Such as Figure 2 and Figure 3As shown, the refrigerant storage box 10 is connected to the stroke piston 5 through the pull rod 6, which solves the problem of converting the deformation of the refrigerant storage box 10 into a control action for the throttling component. When the operating conditions of the refrigeration system change and cause the deformation of the refrigerant storage box 10, the pull rod 6 can quickly transmit this deformation to the stroke piston 5, driving the stroke piston 5 to move to adjust the throttling gap 422, avoiding the delay problem caused by excessive heat transfer links in the traditional thermostatic expansion valve, achieving a rapid response and precise adjustment of the refrigerant flow rate, and effectively improving the performance of the refrigeration system.

[0038] It should be noted that the cross-sectional diameter of the throttling channel 421 is smaller than that of the throttling pipe joint position. When the circulating medium flows through the throttling channel 421, the flow velocity in the throttling channel 421 will increase and the pressure will decrease, thereby achieving a preliminary throttling and pressure reduction effect. Similar to the principle of throttling the circulating medium using small holes or narrow channels in traditional throttling devices, by restricting the flow space of the circulating medium, it consumes energy during the flow process to achieve the purpose of reducing pressure and adjusting the flow rate.

[0039] The size of the throttling gap 422 is adjustable and is determined by the relative position of the stroke piston 5 and the fixed part 7. When the operating conditions of the refrigeration system change, the circulating medium storage box deforms, and the pull rod 6 drives the stroke piston 5 to slide in the mounting hole. The movement of the stroke piston 5 will change the size of the throttling gap 422 between its end face and the fixed part 7. When it is necessary to reduce the flow rate, the stroke piston 5 approaches the fixed part 7, the throttling gap 422 becomes smaller, the resistance for the circulating medium to pass through increases, and the flow rate decreases; conversely, when it is necessary to increase the flow rate, the stroke piston 5 moves away from the fixed part 7, the throttling gap 422 becomes larger, the resistance for the circulating medium to pass through decreases, and the flow rate increases. The dynamically adjustable throttling gap 422 can accurately control the flow rate of the circulating medium according to the actual needs of the refrigeration system, and together with the throttling channel 421, it achieves an efficient and precise throttling effect, ensuring the stable operation of the refrigeration system under different operating conditions.

[0040] As Figure 1 and Figure 2 shown, the housing is provided with a first interface 123 and a second interface 122 communicating with the cavity. The first interface 123 and the second interface 122 are located on different sides of the axis of the throttling pipe and are arranged in a staggered manner; this can make the circulating medium form a more reasonable flow path in the cavity, avoiding pressure fluctuations and energy losses caused by problems such as direct impact of the circulating medium or too fast local flow velocity, helping to improve the heat exchange efficiency between the circulating medium and the refrigerant storage box 10, further enhancing the stability and reliability of the expansion valve in regulating the refrigerant flow rate, and making the refrigeration system operate more smoothly.

[0041] In terms of the assembly and sealing of the expansion valve, it is necessary to ensure that all components are tightly combined and have good sealing performance to prevent the leakage of the circulating medium and ensure the stability of the internal pressure. In this embodiment, asFigure 1 and Figure 5 As shown in Figure 5 , the first housing 1 and the second housing 2 are buckled together, and the intersecting position of the throttle tube and the housing is sealed and fixed, which solves the problems of the convenience and sealing performance of housing assembly. The buckled housing design facilitates the assembly operation during the production and manufacturing process, reduces the assembly difficulty and cost. At the same time, good sealing and fixing ensure the stability of the pressure environment inside the expansion valve, prevent the leakage of the circulating medium, improve the safety and reliability of the expansion valve, and ensure its stable performance during long-term operation.

[0042] As Figure 1 and Figure 5 As shown in Figure 5 , joints are provided at both ends of the throttle tube for convenient connection with external pipelines. One end of the throttle tube is the first joint 331, and the other end is the second joint 332. The first joint 331 is used to connect to the liquid outlet pipe of the condenser, and the second joint 332 is used to connect to the liquid inlet pipe of the evaporator. The setting of the joints makes the connection between the throttle tube and the refrigeration system pipeline more convenient and reliable, facilitating installation and maintenance.

[0043] The spiral throttle channel 421 can cause more stable pressure drop and flow rate changes during the flow of the circulating medium. Compared with the traditional simple throttle structure, the spiral design makes the circulating medium flow through the channel with a longer path and in a spiral shape, increasing the contact area and friction time between the circulating medium and the channel wall. Compared with the traditional simple throttle structure (such as straight-hole throttling), when the circulating medium flows through the spiral channel, the change in its flow velocity is more gentle, without sudden acceleration or deceleration, thus reducing the pressure fluctuations caused by the drastic change in flow velocity. Since the requirements for the flow rate and pressure of the circulating medium vary greatly under different refrigeration conditions, the stable characteristics of the spiral throttle channel 421 enable it to better cope with these changes, better adapt to the refrigeration requirements under different conditions, improve the accuracy and efficiency of throttling, and contribute to enhancing the performance of the entire refrigeration system.

[0044] In addition, the throttle gap 422 and the spiral throttle channel 421 cooperate with each other to achieve more precise flow regulation. The spiral throttle channel 421 provides the basic throttling effect and a stable trend of flow rate and pressure change, while the throttle gap 422 makes dynamic fine-tuning according to the real-time conditions of the refrigeration system. When the system needs to further increase or decrease the flow rate, the throttle gap 422 can quickly respond based on the spiral throttle channel 421 by moving the stroke piston 5, accurately adjusting the flow rate of the circulating medium, enabling the entire throttle assembly to achieve high-precision flow regulation within a wider range of operating conditions, and further enhancing the performance and stability of the refrigeration system.

[0045] As Figure 3 and Figure 4As shown, the mounting hole is opened on the side wall of the throttling tube, the travel piston 5 and the fixing member 7 are arranged in sequence along the axial direction of the mounting hole, the end of the travel piston 5 facing the throttling gap 422 is the piston bottom surface 521, the end of the fixing member 7 facing the throttling gap 422 is the fixing member top surface 522, and the throttling gap 422 for the circulating medium to pass through is formed between the piston bottom surface 521 and the fixing member top surface 522. Figure 4 As shown, after the throttling channel 421 is cut off by the mounting hole, one side of the mounting hole is the first segment of the throttling channel 421, and the other side is the second segment of the throttling channel 421, one side of the throttling gap 422 is connected to the first segment of the throttling channel 421 on one side of the mounting hole, and the other side of the throttling gap 422 is connected to the second segment of the throttling channel 421 on the other side of the mounting hole, so that the inside of the throttling tube is connected, and the first segment of the throttling channel 421 is connected to the second segment of the throttling channel 421 through the throttling gap 422.

[0046] Through reasonable layout, the stroke piston 5 can accurately respond to the drive of the refrigerant storage box 10, accurately adjust the size of the throttling gap 422, and ensure the penetration of the inside of the throttling tube and the smooth flow of the circulating medium. The accuracy and reliability of flow regulation are improved, so that the expansion valve can better adapt to various working conditions of the refrigeration system and maintain a stable refrigeration effect.

[0047] In this embodiment, the fixing member 7 can be a cylindrical plug with a hole, and the hole is for the pull rod 6 to pass through, and a good sliding seal is maintained to prevent the circulating medium from leaking through the hole. The cylindrical plug is installed in the installation hole by threaded fitting or interference fit to block the installation hole. The refrigerant storage box 10 is located outside the installation hole to receive the heat transfer of the circulating medium in the cavity. The blocking effect of the fixing member 7 ensures that the pressure environment inside the throttling tube is stable and prevents the circulating medium from leaking. Providing an installation position for the refrigerant storage box 10 ensures its reasonable layout in the expansion valve, which is conducive to the coordinated work of the refrigerant storage box 10 and other components, improves the overall sealing, stability and reliability of the expansion valve, and helps to maintain the efficient operation of the refrigeration system.

[0048] like Figure 4 As shown, during the flow regulation process, the stroke piston 5 needs to maintain stable movement and reset capabilities under different working conditions, while ensuring that the forces on each component are uniform and the movements are coordinated. The end of the stroke piston 5 away from the throttling gap 422 is abutted against an elastic member 4, and the extension and contraction direction of the elastic member 4, the sliding direction of the stroke piston 5, and the moving direction of the pull rod 6 driven by the refrigerant storage box 10 are parallel or collinear, which solves the movement and reset problems of the stroke piston 5.

[0049] Among them, the elastic member 4 provides stable support and a reset force for the stroke piston 5, enabling it to quickly and accurately return to the initial position or adjust to a suitable position after being driven by the refrigerant storage box 10, ensuring the accuracy of the next flow regulation. The elastic member 4 can be a spring, a compression spring, a rubber spring, etc. The parallel or collinear direction setting ensures uniform force on each component during movement, smooth movement process, reduces friction and energy loss between components, and improves the response speed and regulation accuracy of the expansion valve.

[0050] As Figure 4 and Figure 5 shown, the refrigerant storage box 10 needs to be stably installed in a suitable position, and be able to effectively convert its own deformation into a driving effect on the throttling component, while ensuring the reliability and stability of the connecting components. The refrigerant storage box 10 is installed on the fixing member 7. The refrigerant storage cover 9 of the refrigerant storage box 10 is the deformation surface. The refrigerant storage cover 9 is connected to the pull rod 6 through the cushion block 8 to drive the pull rod 6 to adjust the throttling gap 422 through deformation. The opening of the refrigerant storage box 10 is fitted with a plug 11, which can inject refrigerant into the refrigerant storage box 10. The refrigerant can expand or contract under different temperature changes, so that the refrigerant storage box 10 drives the pull rod 6 to move.

[0051] Installing the refrigerant storage box 10 on the fixing member 7 ensures its stability during the operation of the expansion valve, reducing displacement or damage caused by vibration or other factors. Connecting the pull rod 6 through the cushion block 8 can more effectively transmit the deformation force of the refrigerant storage box 10, ensuring that the pull rod 6 can accurately drive the stroke piston 5 to adjust the throttling gap 422, improving the reliability and response speed of flow regulation, and ensuring the good performance of the expansion valve in the refrigeration system.

[0052] During operation, the refrigerant in the refrigerant storage box changes with the temperature of the circulating medium of the refrigeration system returning through the second interface 122. Through the principle of thermal expansion and contraction, the elastic metal material refrigerant storage cover 9 deforms, and the pull rod 6 is pushed to drive the stroke piston 5 to move. The distance between the bottom surface 521 of the piston and the top surface 522 of the fixing member is the adjustable distance of the throttling gap 422 on the valve body 3. When the temperature of the circulating medium of the refrigeration system returning through the second interface 122 is relatively high, the distance between the bottom surface 521 of the piston and the top surface 522 of the fixing member increases, the throttling gap 422 increases, and the flow rate of the expansion valve increases. Conversely, the flow rate decreases.

[0053] The circulating medium on the low-pressure side of the refrigeration system flows in through the second interface 122 and is stored in the liquid storage tank, and then flows out through the first interface 123. The circulating medium on the high-pressure side flows in through the first joint 331, undergoes a primary throttling through the first section of the spiral throttling channel 421. When the circulating medium reaches the throttling gap 422, it undergoes a secondary throttling. Then, when flowing out of the throttling gap 422, it undergoes a tertiary throttling. Finally, when entering the second section of the throttling channel 421, it undergoes a quaternary throttling. After that, it flows out through the second joint 332 to the liquid inlet pipe of the evaporator, completing the refrigeration cycle.

[0054] Embodiment 2

[0055] In another typical embodiment of the present invention, as Figures 1 - 5 shown, a refrigeration device is provided, which utilizes the liquid storage type thermostatic expansion valve as in Embodiment 1.

[0056] The refrigeration device includes a refrigeration system. As Figures 1 - 5 shown, one side of the cavity of the liquid storage type thermostatic expansion valve is connected to the liquid outlet pipe of the evaporator, and the other side is connected to the suction pipe. One end of the throttle pipe is connected to the liquid outlet pipe of the condenser of the refrigeration system, and the other end of the throttle pipe is connected to the liquid inlet pipe of the evaporator of the refrigeration system.

[0057] A cavity is established by using the housing, and the refrigerant storage box 10 that controls the throttling component adjustment is made to receive the action of the circulating medium in the cavity. When the operating conditions of the refrigeration system change, the changes in the temperature, pressure and other states of the circulating medium will cause the refrigerant storage box 10 to deform, thereby driving the stroke piston 5 to move. The cavity can temporarily store the circulating medium, so that the refrigerant storage box 10 has a larger heat exchange contact area and heat exchange time with the circulating medium, which helps to enhance the heat transfer efficiency between the refrigerant storage box 10 and the refrigeration system, thereby improving the response speed. In addition, the circulating medium in the cavity can also play a buffering role and can maintain a relatively stable state in a short time, thereby providing a relatively stable induction basis for the refrigerant storage box 10 and improving the adjustment accuracy.

[0058] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A liquid storage type thermal expansion valve, characterized in that: include: The shell has a cavity formed inside, and the cavity is connected between the liquid outlet pipe and the air return pipe of the evaporator of the refrigeration system; The valve body includes a throttling assembly and a throttling tube passing through the cavity. The throttling tube is provided with a throttling channel and a mounting hole for cutting off the throttling channel. The throttling assembly includes a fixing part, a stroke piston and a refrigerant storage box. The deformation surface of the refrigerant storage box is connected to the stroke piston after passing through the fixing part through a pull rod. The stroke piston is slidably matched with the mounting hole and is matched with an elastic part. The fixing part is installed in the mounting hole. A throttling gap is formed between the fixing part and the end face of the stroke piston to connect the throttling channels on both sides of the cut-off point. The refrigerant storage box extends into the cavity to receive the action of the circulating medium.

2. The liquid storage type thermal expansion valve according to claim 1, characterized in that: The shell is provided with a first interface and a second interface communicating with the cavity. The first interface and the second interface are located on different sides of the axis of the throttling tube and are arranged in a staggered manner.

3. The liquid storage type thermal expansion valve according to claim 1 or 2, characterized in that: The shell comprises a first shell and a second shell that are buckled together, and the intersection position of the throttle tube and the shell is sealed and fixed.

4. The liquid storage type thermal expansion valve according to claim 1, characterized in that: Joints are respectively arranged at both ends of the throttling tube, and the throttling channel inside the throttling tube is in a spiral shape.

5. The liquid storage type thermal expansion valve according to claim 4, characterized in that: The mounting hole is opened on the side wall of the throttle tube, and the stroke piston and the fixing part are arranged in sequence along the axial direction of the mounting hole. One side of the throttle gap is connected to the throttle channel segment on one side of the mounting hole, and the other side of the throttle gap is connected to the throttle channel segment on the other side of the mounting hole, so that the inside of the throttle tube is connected.

6. The liquid storage type thermal expansion valve according to claim 4 or 5, characterized in that: One end of the stroke piston away from the throttling gap is in contact with an elastic member, and the expansion and contraction direction of the elastic member, the sliding direction of the stroke piston, and the moving direction of the pull rod driven by the refrigerant storage box are parallel or collinear.

7. The liquid storage type thermal expansion valve according to claim 1, characterized in that: The refrigerant storage box is installed on the fixing member, the refrigerant storage cover of the refrigerant storage box is a deformation surface, and the refrigerant storage cover is connected to the pull rod through a pad block so as to drive the pull rod to adjust the throttling gap through deformation.

8. The liquid storage type thermal expansion valve according to claim 7, characterized in that: The fixing member blocks the mounting hole, and the refrigerant storage box is located outside the mounting hole.

9. A refrigeration device, characterized in that: Utilize the liquid storage type thermal expansion valve as described in any one of claims 1-8.

10. The refrigeration device according to claim 9, characterized in that: The refrigeration equipment includes a refrigeration system, one side of the liquid storage thermal expansion valve cavity is connected to the evaporator liquid outlet pipe, and the other side is connected to the return air pipe, one end of the throttling tube is connected to the condenser liquid outlet pipe of the refrigeration system, and the other end of the throttling tube is connected to the evaporator liquid inlet pipe of the refrigeration system.

Images