Thermal expansion valve

Abstract

The invention discloses a thermostatic expansion valve which is characterized by comprising a valve body part and a control part, the control component comprises a gas box body and a temperature sensing bulb, the gas box body is provided with a gas cavity, the temperature sensing bulb is provided with a temperature sensing cavity, and the gas cavity is communicated with the temperature sensing cavity through a capillary tube; the valve body component comprises a valve body, the gas tank body is fixedly connected with the valve body component, the valve body is provided with a detection cavity and a mounting cavity, and the detection cavity is communicated with the mounting cavity; the thermal bulb is at least partially located in the mounting cavity. According to the thermal expansion valve, the sensitivity of the thermal expansion valve for sensing the temperature change of a system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration control, and in particular relates to a thermal expansion valve. Background Art

[0002] It is common to use thermal expansion valves in refrigeration control systems. Figure 1 The schematic diagram of the structure of a thermal expansion valve is a background technology. As a specific application mode, when the refrigeration system is working, the refrigerant at the outlet of the condenser flows into the inner cavity from the inlet 2 of the thermal expansion valve, and is converted into a low-temperature, low-pressure non-saturated liquid refrigerant through the throttling and pressure reduction effect of the valve port 3, and flows out from the outlet 4. Subsequently, the refrigerant enters the inlet of the evaporator (not shown in the figure) for heat exchange, and is converted into a low-temperature, low-pressure gaseous refrigerant, and then flows from the outlet of the evaporator into the detection cavity 5 of the thermal expansion valve, and enters the suction end of the compressor through the detection cavity 5.

[0003] In the detection cavity 5, the change of the refrigerant pressure is transmitted to the medium in the air cavity 6 above through the diaphragm; at the same time, the temperature sensing package (not shown in the figure) set on the evaporator senses the refrigerant temperature at the outlet of the evaporator, and transmits it to the medium in the air cavity 6 through the capillary 7 in the form of the change of the medium pressure, and the change of the medium pressure in the air cavity 6 is also transmitted to the diaphragm. Since the valve core 8, the valve stem 9 and the diaphragm are axially abutted, the pressure change of the diaphragm causes the valve core to axially displace relative to the valve port 3 to adjust the opening of the valve port 3.

[0004] In the above-mentioned background technology solutions, how to improve the sensitivity of the thermal expansion valve in sensing the temperature change of the system is an issue that technicians in this field need to consider. Summary of the invention

[0005] To this end, the present invention discloses a thermal expansion valve, comprising a valve body component and a control component; the control component comprises an air box body and a temperature sensing bag, the air box body has an air cavity, the temperature sensing bag has a temperature sensing cavity, the air cavity is connected to the temperature sensing cavity through a capillary; the valve body component comprises a valve body, the air box body is fixedly connected to the valve body, the valve body has a detection cavity and an installation cavity, the detection cavity is connected to the installation cavity, the temperature sensing bag is at least partially located in the installation cavity, and the temperature sensing bag can sense changes in the temperature of the refrigerant passing through the detection cavity.

[0006] The thermal expansion valve provided by the present invention improves the sensitivity of the thermal expansion valve in sensing system temperature changes by arranging a temperature sensing package in the installation cavity of the valve body and communicating the detection cavity with the installation cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 : A schematic diagram of the structure of a thermal expansion valve of the background technology;

[0008] Figure 2: A front view and a side view of a thermal expansion valve structure provided by the present invention;

[0009] Figure 3 : Figure 2 Schematic diagram of the local area in;

[0010] Figure 4 : Figure 2 Schematic diagram of the structure of the middle valve body;

[0011] Figure 5 : Figure 2 Schematic diagram of the three-dimensional structure of the medium temperature sensing cylinder;

[0012] Figure 6 : Figure 2 A schematic diagram of the three-dimensional structure of the middle connecting piece;

[0013] Figure 7 : The temperature sensing package provided by the present invention is installed on another form of the valve body.

[0014] Figure 2-Figure 7 Symbols and diagrams:

[0015] 10-Thermal expansion valve;

[0016] 100-valve body parts;

[0017] 110-valve body;

[0018] 111 - first side surface, 112 - second side surface, 113 - third side surface;

[0019] 130-support spring;

[0020] 200-control components;

[0021] 210-gas box body;

[0022] 211- air cavity;

[0023] 212-diaphragm;

[0024] 220 / 220A-temperature sensing package;

[0025] 221-Temperature sensing chamber;

[0026] 222-temperature sensing tube;

[0027] 223- bottom cover;

[0028] 224 / 224A-first radial protrusion;

[0029] 225- second radial protrusion;

[0030] 230 - capillary;

[0031] 300-valve core parts;

[0032] 310-valve core;

[0033] 320- transmission parts;

[0034] 330-transmission plate;

[0035] 410-connector;

[0036] 411- communication hole;

[0037] 412-center mounting hole;

[0038] 420-seal;

[0039] 430-Snap ring;

[0040] 510-valve chamber;

[0041] 520- detection chamber;

[0042] 530-valve port;

[0043] 540 / 540A-Mounting cavity;

[0044] 541 / 541A-first step portion, 542-second step portion;

[0045] 543-Card slot;

[0046] 551 / 552 / 553 - port;

[0047] 600-adsorbent;

[0048] 710-first port, 720-second port;

[0049] 730 - third port, 740 - fourth port. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The directional words such as upper and lower involved in this article are defined by the positions of the parts shown in the drawings relative to each other, just for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0051] Figure 2 The front view and side view of a thermal expansion valve structure provided by the present invention are as follows: Figure 3 for Figure 2 Schematic diagram of the local area in .

[0052] like Figure 2 and Figure 3 In this specific embodiment, the thermal expansion valve 10 includes a valve body component 100 , a control component 200 and a valve core component 300 . The thermal expansion valve 10 has a first port 710 , a second port 720 , a third port 730 and a fourth port 740 .

[0053] The valve body component 100 includes a valve body 110 . The valve body 110 can be made of metal profiles and is roughly a square structure. The valve body 110 has a valve cavity 510 , a detection cavity 520 and an installation cavity 540 , and the valve body 110 includes a valve port 530 .

[0054] The control component 200 includes an air box body 210 and a temperature sensing package 220. The air box body 210 can be installed on the upper end of the valve body 110 by threaded connection or welding connection. The air box body 210 has an air cavity 211, and the temperature sensing package 220 includes a temperature sensing cavity 221. The air cavity 211 is connected with the temperature sensing cavity 221 through a capillary 230. The diaphragm 212 of the air box body 210 seals the air cavity 211, and the side of the diaphragm 212 opposite to the air cavity 211 faces the detection cavity 520.

[0055] The valve core component 300 includes a rod-shaped valve core 310 and a transmission member 320. The valve core 310 is partially located in the valve cavity 510 and cooperates with the valve port 530. The transmission member 320 penetrates the detection cavity 520. The upper end of the transmission member 320 abuts against the diaphragm 212 through the transmission sheet 330, and the lower end of the transmission member 320 abuts against the valve core 310. A support spring 130 is also provided in the valve cavity 510, and the support spring 130 elastically supports the valve core 310 upward. In the longitudinal direction of the thermal expansion valve 10, the valve core 310 is in an upper / lower dynamic force balance state. When the pressure of the medium in the air cavity 211 changes, it can be transmitted to the transmission member 320 through the axial displacement of the diaphragm 212, and the transmission member 320 is transmitted to the valve core 310, so that the valve core 310 is displaced relative to the valve port 530 to establish a new force balance. The above actions play a role in flow throttling control of the thermal expansion valve 10.

[0056] In the above technical solution, the detection cavity 520 and the installation cavity 540 are directly connected inside the valve body 110, and the temperature sensing package 220 is arranged in the installation cavity 540. The medium in the temperature sensing cavity 221 can sense the temperature change of the fluid flowing into the detection cavity 520 and produce a pressure change, and transmit the pressure change to the air cavity 211 through the capillary 230.

[0057] As an optional operation mode, after the thermal expansion valve 10 is connected to the refrigeration system, the refrigerant at the outlet of the condenser flows in from the first port 710, passes through the throttling and pressure reduction effect of the valve port 530, is converted into a low-temperature, low-pressure non-saturated liquid refrigerant, and flows out from the second port 720. Then the refrigerant enters the inlet of the evaporator for heat exchange, is converted into a low-temperature, low-pressure gaseous refrigerant, and then flows from the outlet of the evaporator through the third port 730 into the detection chamber 520 of the thermal expansion valve 10, and then flows out from the fourth port 740 and enters the suction end of the compressor.

[0058] Since the detection cavity 520 and the installation cavity 540 are directly connected on the valve body 110, the temperature sensing package 220 directly senses the temperature change of the refrigerant medium flowing into the detection cavity 520, and then converts it into a change in medium pressure through the gas / liquid two-phase change of the internal medium, which is transmitted to the medium in the gas cavity 211 through the capillary 230 and acts on the diaphragm 212. The diaphragm 212 also senses the pressure change of the refrigerant medium in the detection cavity 520 of the valve body 110 at the same time. Under the influence of the combined effect, the diaphragm 212 causes the valve core 310 to move relative to the valve port 530, thereby achieving the throttling control function of the thermal expansion valve 10.

[0059] The above technical solution, by setting the temperature sensing package in the installation cavity of the valve body, directly senses the change of the refrigerant temperature passing through the detection cavity, thereby improving the sensitivity of the thermal expansion valve to sense the temperature change of the system.

[0060] As a further technical effect, compared with the temperature-sensing package being arranged at the evaporator end of the refrigeration or being arranged away from the valve body, the length of the capillary tube connecting the gas box and the temperature-sensing package is relatively shortened, thereby improving the sensitivity of the thermal expansion valve to sensing the temperature changes of the system; at the same time, another benefit of the above technical solution is that the temperature-sensing package can be installed together with the product at one time, which is simple and convenient to install.

[0061] As a specific implementation scheme, the direction of the axial displacement of the transmission member 320 and the rod-shaped valve core 310 is set as the longitudinal direction, and the axis of the axial movement direction of the transmission member 320 is defined as X1. The transverse direction of the valve body includes a first channel and a second channel, the first channel serves as a detection chamber 520, and the two ports 551 and 552 of the first channel are respectively located on the first side 111 and the second side 112 of the valve body 110, and serve as the third port 730 and the fourth port 740 of the thermal expansion valve; the second channel serves as the installation chamber 540, the inner port of the second channel is connected to the detection chamber 520, and the port 553 of the second channel is located on the third side 113 of the valve body 110. Define the axis of the first channel as Y1, and the axis of the second channel as Y2, then, the axis X1 is substantially perpendicular to the axis Y1, the axis X1 is substantially perpendicular to the axis Y2, and the axis Y1 is substantially perpendicular to the axis Y2. And in the longitudinal height direction of the thermal expansion valve 10, the axis Y1 and the axis Y2 approximately intersect (in this technical solution, manufacturing and measurement errors, as well as deviations that do not affect the technical effects are taken into consideration and summarized as "approximately").

[0062] The above structural arrangement facilitates the chamber processing of the valve body 110, and the detection chamber 520 is close to the installation chamber 540, so that the temperature difference of the fluid medium in the two chambers is small, thereby improving the detection sensitivity.

[0063] Figure 4 for Figure 2 Schematic diagram of the structure of the valve body. Figure 5 for Figure 2 Schematic diagram of the three-dimensional structure of the medium temperature sensing cylinder. Figure 6 for Figure 2 Schematic diagram of the three-dimensional structure of the connecting part.

[0064] like Figure 4 , Figure 5 and Figure 6 Shown and referenced Figure 3 As a specific implementation scheme, the temperature sensing package 220 includes a cylindrical temperature sensing tube 222 and a bottom cover 223 made of a plate. The temperature sensing tube 222 and the bottom cover 223 are welded and fixed to form a temperature sensing cavity 221, and the temperature sensing cavity 221 is filled with a temperature sensing medium.

[0065] Since the radial diameter of the bottom cover 223 is larger than the radial diameter of the temperature sensing tube 222, the outer edge of the bottom cover 223 forms a first radial protrusion 224; the outer edge side wall of the temperature sensing tube 222 includes a second radial protrusion 225. The side wall of the installation cavity 540 includes a first step portion 541, a second step portion 542 and a slot 543. The second step portion 542 is closer to the detection cavity 520 than the first step portion 441.

[0066] As an optional installation structure of the temperature-sensing package 220 and the valve body 110, the connecting piece 410 can be first placed through the port 553 of the installation cavity 540, and then the sealing piece 420 can be placed. The temperature-sensing package 220 is installed in the installation cavity 540. Along the axial direction of the temperature-sensing package 220, the first radial protrusion 224 of the bottom cover 223 is indirectly abutted against the first step 541 of the installation cavity 540 through the sealing piece 420, and the second radial protrusion 225 of the temperature-sensing tube 222 is directly abutted against the connecting piece 410, so that the connecting piece 410 and the second step 542 of the installation cavity 540 are limitedly matched, such as directly abutting or clearance matching. The clamping ring 430 is installed in the clamping groove 543 of the installation cavity 540, and the clamping ring 430 is abutted against the temperature-sensing package 220, so that the temperature-sensing package 220 is limited in the installation cavity 540. The above technical solution makes the installation structure of the temperature-sensing package 220 and the valve body 110 simple and reliable.

[0067] As a further technical solution, Figure 6 As shown, the connector 410 includes a central mounting hole 412 and circumferentially distributed communication holes 411. The front end of the temperature sensing package 220 is radially limited by penetrating the central mounting hole 412, and the rear end of the temperature sensing package 220 is radially limited by the outer edge of the bottom cover 223 and the side wall of the mounting cavity 540, so that the temperature sensing package 220 can be further installed reliably. Moreover, the refrigerant in the detection cavity 520 can flow in through the communication holes 411, so that the radial peripheral wall of the temperature sensing package 220 is fully in contact with the refrigerant, thereby improving the sensitivity of the temperature sensing package 220 to sense temperature changes.

[0068] As a further technical solution, Figure 3 As shown, the temperature sensing package 220 further includes an adsorbent 600, which is placed in the temperature sensing cavity 221, and the volume of the adsorbent 600 is greater than 1 / 2 of the volume of the temperature sensing cavity 221. The above can further improve the stability of the pressure fluctuation of the detection medium in the temperature sensing cavity 221.

[0069] Figure 7 This is another form of installing the temperature sensing package provided by the present invention on the valve body.

[0070] like Figure 7 As shown. The difference from the above technical solution is that the side wall of the installation cavity 540 includes a first step portion 541A, the temperature sensing package 220 includes a first radial protrusion 224A, along the axial direction of the temperature sensing package 220, the first radial protrusion 224A directly abuts against the first step portion 541A, and the outer wall of the temperature sensing package 220 and the side wall of the installation cavity 540 are installed in a limited position. The sealing member 420A abuts against the temperature sensing package 220A, and the retaining ring 430A is limited.

[0071] The above are only preferred implementation modes for better illustrating the technical solution of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. All these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A thermal expansion valve, Features , including a valve body component and a control component; the control component includes an air box body and a temperature sensing bag, the air box body has an air cavity, the temperature sensing bag has a temperature sensing cavity, the air cavity is connected to the temperature sensing cavity through a capillary; the valve body component includes a valve body, the air box body is fixedly connected to the valve body, the valve body has a detection cavity and an installation cavity, the detection cavity is connected to the installation cavity, the temperature sensing bag is at least partially located in the installation cavity, and the temperature sensing bag can sense changes in the temperature of the refrigerant passing through the detection cavity.

2. The thermal expansion valve according to claim 1, It is characterized in that It also includes a valve core component, which includes a valve core and a transmission component. The valve body has a valve port, and the valve core cooperates with the valve port. The air box body includes a diaphragm, which seals the air cavity. The diaphragm can sense changes in the detection cavity and the medium pressure in the air cavity. The valve core abuts against the transmission component, and the transmission component abuts against the diaphragm directly or indirectly.

3. The thermal expansion valve according to claim 2, It is characterized in that The valve body includes a first channel and a second channel, wherein two ports of the first channel are respectively located on a first side and a second side of the valve body; the second channel is connected to the first channel, and a port of the second channel is located on a third side of the valve body; the first channel serves as the detection cavity, and the second channel serves as the installation cavity.

4. The thermal expansion valve according to claim 3 is characterized in that: the axis of the moving direction of the transmission member is X1, the axis of the first channel is Y1, and the axis of the second channel is Y2, then, the axis X1 is approximately perpendicular to the axis Y1, the axis X1 is approximately perpendicular to the axis Y2, the axis Y1 is approximately perpendicular to the axis Y2, and the axis Y1 and the axis Y2 approximately intersect.

5. The thermal expansion valve according to claim 1, It is characterized in that The temperature sensing package further includes an adsorbent, which is placed in the temperature sensing cavity, and the volume of the adsorbent is greater than 1 / 2 of the volume of the temperature sensing cavity.

6. The thermal expansion valve according to any one of claims 1 to 5, It is characterized in that The side wall of the installation cavity includes a first step portion, and the temperature sensing package includes a first radial protrusion portion. Along the axial direction of the temperature sensing package, the first radial protrusion portion directly or indirectly abuts against the first step portion.

7. The thermal expansion valve according to claim 6, It is characterized in that It also includes a connecting piece, the side wall of the installation cavity also includes a second step portion, the temperature sensing package also includes a second radial protrusion, the second step portion is closer to the detection cavity than the first step portion, along the axial direction of the temperature sensing package, the connecting piece is directly or indirectly abutted against the second step portion, the connecting piece is limitedly matched with the second radial protrusion, and the connecting piece includes a connecting hole.

8. The thermal expansion valve according to claim 6, It is characterized in that The temperature sensing package includes a temperature sensing tube and a bottom cover. The temperature sensing tube is welded and fixed to the bottom cover. The bottom cover includes the first radial protrusion.

9. The thermal expansion valve according to claim 7, It is characterized in that The temperature-sensing package includes a temperature-sensing tube and a bottom cover, the temperature-sensing tube is fixed to the bottom cover by welding, the bottom cover includes the first radial protrusion, and the temperature-sensing tube includes the second radial protrusion.

10. The thermal expansion valve according to claim 8 or 9, It is characterized in that It also includes a seal and a retaining ring. The side wall of the installation cavity also includes a retaining groove. The retaining ring is arranged in the retaining groove. The retaining spring abuts against the first radial protrusion. The seal is arranged on the first step portion. The first radial protrusion abuts against the first step portion through the seal.

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