Thermal expansion valve

Abstract

The thermostatic expansion valve comprises a valve body component and an air box component, and the valve body component is provided with a detection cavity; the gas tank component comprises a gas tank body and a temperature sensing bulb, the gas tank body comprises a gas cavity, the gas tank component is characterized by further comprising a detection component, the detection component is provided with a containing cavity and a communicating cavity, the communicating cavity is communicated with the detection cavity, and at least part of the temperature sensing bulb is located in the containing cavity; the detection component comprises a detection part, a part of the detection part serves as a part of the cavity wall of the containing cavity, another part of the detection part serves as a part of the cavity wall of the communication cavity, and at least part of the pipe wall of the temperature sensing bulb is attached to the detection part. The sensitivity of the thermostatic expansion valve for sensing the temperature change of the 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] The change of the refrigerant pressure in the detection chamber 5 is transmitted to the diaphragm; at the same time, the temperature sensing package (not shown in the figure) arranged 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 an air box component, wherein the valve body component has a detection cavity, the air box component comprises an air box body and a temperature sensing package, the air box body is fixedly connected to the valve body component, the air box body comprises an air cavity, and the air cavity is connected to the inner cavity of the temperature sensing package through a capillary tube;

[0006] It also includes a detection component, the valve body component is fixedly connected to the detection component, the detection component has a accommodating cavity and a communicating cavity, the communicating cavity is communicated with the detection cavity, and the temperature sensing package is at least partially located in the accommodating cavity; the detection component includes a detection part, a part of the detection part serves as a part of the cavity wall of the accommodating cavity, another part of the detection part serves as a part of the cavity wall of the communicating cavity, and at least a part of the tube wall of the temperature sensing package is in contact with the detection part.

[0007] The thermal expansion valve provided by the present invention has a detection component fixedly connected to the valve body component, and the connecting cavity of the detection component is connected to the detection cavity. The temperature sensing package can sense the change of the refrigerant temperature passing through the connecting cavity, so that the length of the capillary tube connecting the gas box body and the temperature sensing package is relatively shortened, thereby improving the sensitivity of the thermal expansion valve to sensing the temperature change of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 : A schematic diagram of the structure of a thermal expansion valve of the background technology;

[0009] Figure 2 : A schematic structural diagram of a thermal expansion valve provided by the present invention;

[0010] Figure 3 : Figure 2 A schematic diagram of a specific structure of the detection component in;

[0011] Figure 4 : Figure 2 The overall stereogram of the thermal expansion valve;

[0012] Figure 5 : Schematic diagram of the connection relationship between the main pipe part and the cavity part of the split structure;

[0013] Figure 6 : Figure 2 A specific structural schematic diagram of the elastic clamp;

[0014] Figure 7 : Figure 4 Side view of some areas;

[0015] Figure 8 : A schematic diagram of another installation method of an elastic clip provided by the present invention.

[0016] Figure 2-Figure 8 Symbols and diagrams:

[0017] 10-Thermal expansion valve;

[0018] 100-valve body parts;

[0019] 110-valve body;

[0020] 111-connecting part;

[0021] 120-connecting flange;

[0022] 121-flange body;

[0023] 122 / 123-takeover;

[0024] 130-support spring;

[0025] 200-air box parts;

[0026] 210-gas box body;

[0027] 211- air cavity;

[0028] 212-diaphragm;

[0029] 220-temperature sensing package;

[0030] 221-pipeline;

[0031] 222-curved bottom;

[0032] 230 - capillary;

[0033] 300-Valve core parts

[0034] 310-valve core;

[0035] 320- transmission parts;

[0036] 400-Detection component;

[0037] 410 / 410A-accommodation piece;

[0038] 411 / 411A-Detection Department;

[0039] 412 / 412A- competent department;

[0040] 413 / 413A-Cavity part;

[0041] 414-first radial protrusion;

[0042] 415 - second radial protrusion;

[0043] 420-Mounting parts;

[0044] 421-first mounting portion / outer circular step portion;

[0045] 422- second mounting portion / inner circle step portion;

[0046] 423-bolt hole;

[0047] 424-first hole, 425-second hole; 510-valve chamber;

[0048] 520- detection chamber;

[0049] 530-valve port;

[0050] 540-accommodation chamber;

[0051] 550- communication cavity;

[0052] 600 / 600A-elastic clamp;

[0053] 610- first elastic portion;

[0054] 620- second elastic portion;

[0055] 710-first port, 720-second port;

[0056] 730-third port, 740-fourth port;

[0057] 810-System piping. DETAILED DESCRIPTION

[0058] 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.

[0059] Figure 2 This is a schematic diagram of the structure of a thermal expansion valve provided by the present invention. Figure 3 for Figure 2 A schematic diagram of a specific structure of the detection component in FIG. Figure 4 for Figure 2 Overall three-dimensional diagram of the thermal expansion valve.

[0060] like Figure 2 , Figure 3 and Figure 4 In this specific embodiment, the thermal expansion valve 10 includes a valve body component 100 , a gas box component 200 , a valve core component 300 and a detection component 400 . The thermal expansion valve 10 has a first port 710 , a second port 720 , a third port 730 and a fourth port 740 .

[0061] The valve body component 100 includes a valve body 110 and a connecting flange 120. 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 and a detection cavity 520, and the valve body 110 includes a valve port 530. The connecting flange 120 includes a flange body 121, a connecting pipe 122 and a connecting pipe 123. The connecting pipe 122 and the connecting pipe 123 are respectively welded and fixed to the flange body 121, and the flange body 121 can be installed on the valve body 110 by external bolts.

[0062] The gas box component 200 includes a gas box body 210 and a temperature sensing package 220. The gas box body 210 is installed on the upper end of the valve body 110 by threaded connection or welding. The gas box body 210 has an air cavity 211, and the diaphragm 212 is welded and fixed to the gas box body 210 to seal the air cavity 211. The side of the diaphragm 212 opposite to the air cavity 211 faces the detection cavity 520. The air cavity 211 is connected to the inner cavity of the temperature sensing package 220 through a capillary 230.

[0063] 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 adapted to 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, 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 transmits it to the valve core 310, so that the dynamic force balance of the valve core 310 is broken, and 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.

[0064] The detection member 400 includes a container 410 and a mounting member 420. As a specific technical solution, the container 410 includes an integrally formed main pipe portion 412 and a cavity portion 413, the inner cavity of the main pipe portion 412 serves as a connecting cavity 550, and the inner cavity of the cavity portion 413 serves as a containing cavity 540. The axis X1 of the connecting cavity 550 and the axis X2 of the containing cavity 540 are parallel to each other.

[0065] The mounting member 420 is a roughly block-shaped structure, having a first hole 424 and a second hole 425 that are parallel to each other and extend in the thickness manner. One end of the first hole 424 extends outward to form an outer circular step portion 421 as a first mounting portion, and the inner wall of the other end of the first hole 424 forms an inner circular step portion 422 as a second mounting portion. The inner circular step portion 422 is coaxially arranged with the outer circular step portion 421. The step surface of the inner circular step portion 422 is mounted in abutment with the main pipe portion 412, and the accommodating member 410 and the mounting member 420 are fixedly connected by welding. The outer circular step portion 421 extends into the detection cavity 520 of the valve body 110, and the side portion corresponding to the cavity opening of the detection cavity 520 serves as the connecting portion 111. The step surface of the outer circular step portion 421 is in abutment with the connecting portion 111. A threaded hole (not shown in the figure) is machined on the valve body 110, and a bolt hole 423 is machined in the thickness direction of the mounting member 420 (see Figure 4), the mounting member 420 can be detachably fixed to the valve body 110 by means of threaded fasteners. (Of course, as another installation method, a through hole is machined on the valve body 110, and the mounting member 420 can be detachably fixed to the valve body 110 by means of bolts passing through the through hole).

[0066] After the thermal expansion valve 10 is connected to the system, as an optional operation mode, the refrigerant at the outlet of the condenser flows from the first port 710 into the connecting pipe 122, and is converted into a low-temperature, low-pressure non-saturated liquid refrigerant through the throttling and pressure reduction effect of the valve port 530, and flows out from the second port 720. Then the refrigerant enters the inlet of the evaporator for heat exchange, and 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 connecting pipe 123 through the fourth port 740, and enters the suction end of the compressor.

[0067] In the above-mentioned installation structure, the detection cavity 520 of the valve body 110 is directly connected to the communication cavity 550, the tube wall between the accommodating cavity 540 and the communication cavity 550 serves as the detection part 411, part of the detection part 411 serves as part of the cavity wall of the accommodating cavity 540, and another part of the detection part 411 serves as part of the cavity wall of the communication cavity 550. The temperature sensing package 220 is located in the accommodating cavity 540, and the tube wall of the temperature sensing package 220 is in contact with the detection part 411.

[0068] In the above technical solution, the temperature sensing package 220 can directly sense the temperature change of the refrigerant medium flowing to the detection chamber 520 in the communication chamber 550 through the detection part 411, and then convert it into a change in medium pressure through the gas / liquid two-phase change of the internal medium, and transmit it to the medium in the gas chamber 211 through the capillary 230, and act on the diaphragm 212. The diaphragm 212 also senses the pressure change of the refrigerant medium in the detection chamber 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 effect of the thermal expansion valve 10.

[0069] Compared with the solution in which the temperature-sensing package is arranged at the evaporator end of the refrigeration, in the above technical solution, the air box body and the temperature-sensing package of the air box component are directly installed on the valve, so that the length of the capillary connecting the air box body and the temperature-sensing package is relatively shortened, thereby improving the sensitivity of the thermal expansion valve to sense the temperature changes of the system; at the same time, another benefit of the above technical solution is that the temperature-sensing package is installed with the product at one time, which is simple and convenient to install.

[0070] Figure 5 It is a schematic diagram of the connection relationship between the main pipe part and the cavity part of the split structure.

[0071] This figure is a cross-sectional view of the receiving member 410A in the longitudinal direction. Figure 5As an extension of the above technical solution, the main pipe part 412A and the cavity part 413A of the container 410A are both tubular monomers, and the main pipe part 412A and the cavity part 413A are welded and connected in the W area after they are abutted. The abutting area of ​​the main pipe part 412A and the cavity part 413A serves as the detection part 411A, that is, the detection part 411A includes the tube wall of the relevant abutting part of the main pipe part 412A and the tube wall of the cavity part 413A. This technical solution can also achieve the effect of the above technical solution, and will not be repeated here.

[0072] As a further development of this technical solution, the outer side of the container 410A may be covered with a heat-insulating material to reduce the temperature diffusion of the detection part and improve the accuracy of the medium temperature transfer.

[0073] Figure 6 for Figure 2 A specific structural diagram of the elastic clip, Figure 7 for Figure 4 Side view of part of the area.

[0074] like Figure 6 and Figure 7 As shown, and refer to Figure 2 and Figure 3 As a further extension of the above technical solution, the thermal expansion valve 10 further includes an elastic clamp 600, which is at least partially located in the accommodating chamber 540. The temperature sensing package 220 is fixed in the accommodating chamber 540 by abutting one side of the elastic clamp 600 against the cavity wall of the accommodating chamber 540 and the other side against the temperature sensing package 220.

[0075] As a specific implementation, a side of the accommodating cavity 540 close to the valve body component 100 includes a second radial protrusion 415 , and the second radial protrusion 415 can limit the axial displacement of the temperature sensing bulb 220 .

[0076] As a further implementation scheme, the temperature-sensing package 220 is roughly a barrel-shaped structure, including a circular tube portion 221 and an arc-shaped bottom portion 222. The elastic clamp 600 is roughly a sheet-shaped structure, including a first elastic portion 610 and a second elastic portion 620. The first elastic portion 610 elastically abuts against the tube portion 221 of the temperature-sensing package 220, so that the temperature-sensing package 220 abuts against the detection portion 411, and the second elastic portion 620 elastically abuts against the arc-shaped bottom portion 221 of the temperature-sensing package 220, decomposing the abutting force through the arc, so that the temperature-sensing package 220 can axially abut against the second radial protrusion 416. This solution has a simple and reliable structure.

[0077] As a further implementation scheme, there are two elastic clamps 600, and in the length direction of the accommodating cavity 540, each elastic clamp 600 deviates from and is symmetrically arranged relative to the axis X2 of the accommodating cavity 540. In this arrangement, each elastic clamp 600 has a component force applied to the temperature sensing package 220 to the detection portion 411, and at the same time, each elastic clamp 600 has a component force applied to the temperature sensing package 220 in the horizontal direction. Due to the symmetrical arrangement, the two pressures in the horizontal direction are opposite, and the temperature sensing package 220 is clamped and fixed in the accommodating cavity 540.

[0078] As a further extension of the above technical solution, a first radial protrusion 414 is included on the side of the communication cavity 550 away from the valve body component 100, and the first radial protrusion 414 serves as a limiter connected to the system pipeline 810. When the detection component 400 is connected to the system pipeline 810, the connection pipeline 810 can be inserted into the communication cavity 550 from the opposite side of the valve body component 100, and abutted against the first radial protrusion 414 for limit, and connected by welding. This technical solution facilitates the installation and connection of the thermal expansion valve 10 and the system pipeline 810.

[0079] Figure 8 This is a schematic diagram of another installation method of the elastic clip provided by the present invention.

[0080] like Figure 8 As an extended technical solution, the elastic clamp 600A can be clamped on the tube wall of the cavity part for fixation, which is convenient for installation.

[0081] 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, characterized in that: It comprises a valve body component and an air box component, wherein the valve body component has a detection cavity, the air box component comprises an air box body and a temperature sensing package, the air box body is fixedly connected to the valve body component, the air box body comprises an air cavity, and the air cavity is connected to the inner cavity of the temperature sensing package through a capillary tube; It also includes a detection component, the valve body component is fixedly connected to the detection component, the detection component has a receiving cavity and a communicating cavity, the communicating cavity is communicated with the detection cavity, and the temperature sensing package is at least partially located in the receiving cavity; The detection component includes a detection part, a part of which serves as a part of the cavity wall of the accommodating cavity, another part of which serves as a part of the cavity wall of the communicating cavity, and at least a part of the tube wall of the temperature sensing package is in contact with the detection part.

2. The thermal expansion valve according to claim 1, characterized in that: The detection component includes a accommodating member and a mounting member, the mounting member includes a first mounting portion, the valve body component includes a connecting portion, and the connecting portion is fixedly connected to the first mounting portion; the accommodating member includes a main pipe portion and a cavity portion, the inner cavity of the main pipe portion serves as the communicating cavity, and the inner cavity of the cavity portion serves as the accommodating cavity; the main pipe portion and the cavity portion are an integral structure, or the main pipe portion and the cavity portion are a tubular structure, and the main pipe portion and the cavity portion are connected by welding.

3. The thermal expansion valve according to claim 2, characterized in that: The valve body component includes a valve body, the air box body is fixedly connected to the valve body, the valve body includes the detection cavity and the connecting portion, the accommodating member is welded and fixedly connected to the mounting member, and the mounting member is detachably fixedly connected to the valve body via threaded fasteners.

4. The thermal expansion valve according to claim 2, characterized in that: The mounting member also includes a second mounting portion, the first mounting portion is an outer circular step portion, the second mounting portion is an inner circular step portion, the inner circular step portion is coaxially arranged with the outer circular step portion, the main pipe portion extends into the inner step portion, the valve body component includes a valve body, the valve body includes the detection cavity, the outer circular step portion extends into the detection cavity, the step surface of the outer circular step portion abuts against the valve body, and the step surface of the inner circular step portion abuts against the main pipe portion.

5. The thermal expansion valve according to any one of claims 1 to 4, characterized in that: It also includes a valve core component, which includes a valve core and a transmission component. The valve body component has a valve port, the valve core is adapted to the valve port, the valve core abuts against the transmission component, and the transmission component can sense the change of the medium pressure in the air cavity and axially displace.

6. The thermal expansion valve according to claim 5, characterized in that: It also includes an elastic clamp, which is at least partially located in the accommodating cavity, the elastic clamp abuts against the cavity wall of the accommodating cavity, and the elastic clamp abuts against the temperature sensing package.

7. The thermal expansion valve according to claim 6, characterized in that The side of the main pipe part away from the valve body component includes a first radial protrusion, and the first radial protrusion serves as a connection limit portion with the pipeline of the flow path system.

8. The thermal expansion valve according to claim 6, characterized in that: The side of the cavity portion close to the valve body component includes a second radial protrusion, and the second radial protrusion can limit the axial displacement of the temperature sensing package.

9. The thermal expansion valve according to claim 8, characterized in that: The temperature-sensing package includes a tube portion and an arc-shaped bottom, and the elastic clamp includes a first elastic portion and a second elastic portion. The first elastic portion elastically abuts against the tube portion so that the temperature-sensing package abuts against the detection portion; the second elastic portion elastically abuts against the arc-shaped bottom so that the temperature-sensing package abuts against the second radial protrusion.

10. The thermal expansion valve according to claim 7, characterized in that: There are two elastic clamps, and in the length direction of the accommodating cavity, each of the elastic clamps is deviated from and symmetrically arranged relative to the axis of the accommodating cavity.

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