Heat pump air conditioner pressure release valve resistant to high temperature and high pressure

Abstract

The invention relates to a high-temperature-resistant and high-pressure-resistant heat pump air conditioner pressure release valve, aims to solve the problem that an existing pressure release valve cannot adapt to a high-temperature and high-pressure environment, and realizes product functions through unique structural design. For external leakage sealing, a pressure release valve shell material having enough hardness difference with a compressor shell is selected, the end face of the pressure release valve shell material is provided with protruding ring teeth, and the ring teeth are extruded and embedded into an end cover of the compressor for sealing through screwing installation. In the aspect of internal leakage sealing, the sealing seat made of a non-metal material is adopted to extrude the inner cone of the shell with small force, and meanwhile, the sealing ball extrudes the inner conical surface of the sealing seat. The sealing seat pressing block is screwed through threads, the spring compression amount is adjusted, and the sealing stability is further enhanced. Compared with the prior art, the problem of leakage caused by creep deformation of a sealing pressing block material at the high temperature is effectively solved, the sealing performance is improved, it is ensured that stable work is conducted in the high-pressure, high-temperature and vibration environment, and the overall performance and safety of a heat pump air conditioning system are remarkably improved.

Description

Technical Field

[0001] The invention relates to a heat pump air conditioner pressure relief valve, in particular to a heat pump air conditioner pressure relief valve resistant to high temperature and high pressure. Background Art

[0002] As new energy electric vehicles have higher requirements for driving range, thermal management plays a key role in the popularization of urban electric transportation, extending battery life, improving driving range and improving drive system performance.

[0003] Heat pump air conditioning is an effective solution for heating pure electric vehicles. In the absence of breakthroughs in power batteries, low-energy heating must be ensured. Heat pump air conditioning is one of the few feasible technologies. Its efficiency coefficient is 2-3 times higher than that of PTC heating, and it can effectively extend the driving range by more than 20%.

[0004] At present, the high pressure of traditional air conditioning system is 13bar-17bar, and the low pressure is 1bar-3bar, both of which belong to the low pressure category. However, due to its high GWP, it has been included in the elimination process. Therefore, R134a is currently only used as a substitute in the transition to environmentally friendly products, and it is only a matter of time before it is completely eliminated. The refrigerant of heat pump air conditioning uses R744 (CO2) carbon dioxide refrigerant, and the system pressure is 170bar high pressure and 130bar low pressure, both of which belong to the high pressure category.

[0005] Therefore, traditional air conditioning pressure relief valves cannot meet the pressure relief requirements when the system pressure reaches 130-170bar. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a high temperature and high pressure resistant heat pump air conditioning pressure relief valve, which effectively solves the leakage problem caused by creep of the sealing block material under high temperature, improves the sealing performance, ensures stable operation under high pressure, high temperature and vibration environment, and significantly improves the overall performance and safety of the heat pump air conditioning system.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention provides a high temperature and high pressure resistant heat pump air conditioner pressure relief valve, comprising a pressure relief valve housing provided with a chamber, a sealing ball, a slider, and a spring provided in the chamber of the pressure relief valve housing, the slider being movably installed in the chamber, an exhaust through hole being provided in the slider, one end of the spring abutting against the slider, and the other end of the spring being limited by a limiting member,

[0009] A sealing kit is provided on one end of the pressure relief valve housing for installation and insertion of the heat pump air conditioner compressor, the sealing kit comprises a sealing seat pressing block and a sealing seat pre-pressed and assembled together, the sealing seat pressing block is screwed to the inner wall of the chamber of the pressure relief valve housing, and the sealing seat comprises an integrally formed first columnar section, a frustum-shaped sealing section, and a second columnar section;

[0010] The top of the first columnar section can abut against the sealing ball for sealing;

[0011] The lower surface of the second columnar section is interference fit with the top of the sealing seat pressing block, and the axial extrusion force provided by the sealing seat pressing block causes the outer conical surface of the frustum-shaped sealing section to be extruded and sealed with the inner wall of the chamber of the pressure relief valve housing.

[0012] Furthermore, the sealing seat pressing block comprises a sealing seat pressing block body and a protrusion provided at the end of the sealing seat pressing block body, and the diameter of the protrusion is smaller than that of the sealing seat pressing block body;

[0013] The sealing seat pressing block body is provided with external threads.

[0014] Furthermore, a docking groove is formed on the lower surface of the second column-shaped section, and the protrusion is interference-fitted with the docking groove.

[0015] Furthermore, the chamber of the pressure relief valve housing is provided with a first straight section, a conical section, a second straight section, and a third straight section which match the sealing kit and are connected in sequence;

[0016] The inner wall surface of the conical surface section and the outer wall surface of the frustum-shaped sealing section are squeezed and sealed.

[0017] Furthermore, the inner wall surface of the first straight section and the outer wall surface of the first column section are clearance-matched;

[0018] The inner wall surface of the second straight section is clearance-matched with the outer wall surface of the second column section.

[0019] Furthermore, the third straight section is provided with an internal thread, and the internal thread cooperates with the external thread on the sealing seat pressing block body.

[0020] Furthermore, a protruding ring gear is provided on the end surface of the pressure relief valve housing for installing and inserting the heat pump air-conditioning compressor of the pressure relief valve housing;

[0021] An external thread is arranged on the outer surface of the pressure relief valve housing, and the pressure relief valve housing is fastened in the heat pump air-conditioning compressor through the external thread, so that the protruding ring teeth are squeezed and sealed with the counterpart.

[0022] Furthermore, the sealing seat is made of plastic.

[0023] Furthermore, the plastic is one of polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene sulfide, polyetheretherketone, polysulfone and polyarylsulfone.

[0024] Furthermore, the sealing seat pressing block is made of one of stainless steel, aluminum alloy, titanium alloy and copper alloy.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) In terms of internal leakage sealing, the present invention exhibits unique advantages through the pre-pressed assembly of the sealing seat pressing block and the sealing seat. The sealing seat made of non-metallic material is squeezed and sealed with the outer conical surface of the shell with a relatively small force, and the sealing ball is used to squeeze the inner conical surface of the sealing seat, thereby achieving an efficient internal sealing effect. This design not only optimizes the sealing performance, but also reduces the risk of damage to the internal structure caused by excessive pressure at working temperature. In addition, the sealing seat is given thrust by the sealing seat pressing block, which further enhances the stability and reliability of the internal seal, ensuring that the pressure relief valve can still function accurately and stably under high pressure, high temperature and vibration environment, greatly improving the overall performance and safety of the heat pump air conditioning system.

[0027] 2) The heat pump air conditioner pressure relief valve of the present invention has significantly improved sealing performance. Its external leakage seal adopts a hard seal method in which metal materials are pressed against each other, which solves the problem of mechanical performance degradation caused by creep of materials in high temperature environments, thereby causing sealing leakage. Protruding ring teeth are set on the end face of the shell design. When tightened and installed with the compressor shell, the protruding ring teeth at the end can be firmly squeezed and embedded in the compressor end cover, achieving reliable external sealing and effectively preventing leakage of external media. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a heat pump air-conditioning pressure relief valve resistant to high temperature and high pressure in the present invention;

[0029] In the figure: 1, pressure relief valve housing, 2, limit member, 3, spring, 4, slider, 5, sealing ball, 6, sealing seat, 61, first columnar section, 62, frustum-shaped sealing section, 63, second columnar section, 7, sealing seat pressing block, 71, raised portion, 72, sealing seat pressing block body, 8, protruding ring teeth, 9, conical surface section.

[0030] Figure 2 This is the actual test scene diagram of the alternating pressure test;

[0031] Figure 3 This is the actual test interface diagram for the alternating pressure test;

[0032] Figure 4 This is the actual test scene diagram of the alternating temperature test;

[0033] Figure 5 This is the actual test interface diagram of the alternating pressure test. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Any features such as preparation means, materials, structures or composition ratios not clearly described in this technical solution are regarded as common technical features disclosed in the prior art.

[0035] Example 1

[0036] The high temperature and high pressure resistant heat pump air conditioner pressure relief valve in this embodiment comprises a pressure relief valve housing 1 provided with a chamber, a sealing ball 5, a slider 4 and a spring 3 are provided in the chamber of the pressure relief valve housing 1, the slider 4 is movably installed in the chamber, an exhaust through hole is provided in the slider 4, one end of the spring 3 is in contact with the slider 4, and the other end of the spring 3 is limited by a limiter 2, and a sealing kit is provided in one end of the pressure relief valve housing 1 for installing and inserting the heat pump air conditioner compressor, and the sealing kit comprises a sealing kit pre-pressed and assembled together. The sealing seat pressing block 7 and the sealing seat 6, the sealing seat pressing block 7 is screwed to the inner wall of the chamber of the pressure relief valve housing 1, and the sealing seat 6 includes a first columnar section 61, a frustum-shaped sealing section 62, and a second columnar section 63 that are integrally formed; the top of the first columnar section 61 can abut against the sealing ball 5 for sealing; the lower surface of the second columnar section 63 is interference fit with the top of the sealing seat pressing block 7, and the axial extrusion force provided by the sealing seat pressing block 7 causes the outer cone surface of the frustum-shaped sealing section 62 to be extruded and sealed with the inner wall of the chamber of the pressure relief valve housing 1.

[0037] The sealing seat pressing block 7 comprises a sealing seat pressing block body 72 and a protrusion 71 arranged at the end of the sealing seat pressing block body 72, wherein the diameter of the protrusion 71 is smaller than the sealing seat pressing block body 72; the sealing seat pressing block body 72 is provided with an external thread.

[0038] A docking groove is formed on the lower surface of the second column section 63 , and the protrusion 71 is interference fit with the docking groove.

[0039] The chamber of the pressure relief valve housing 1 is provided with a first straight section, a conical section 9 , a second straight section, and a third straight section which match the sealing kit and are connected in sequence; the inner wall surface of the conical section 9 is squeezed and sealed with the outer wall surface of the frustum-shaped sealing section 62 .

[0040] The inner wall of the first straight section is in clearance with the outer wall of the first column section 61; the inner wall of the second straight section is in clearance with the outer wall of the second column section 63. The third straight section is provided with an internal thread, which is in clearance with the external thread on the sealing seat pressing block body 72.

[0041] A protruding ring tooth 8 is provided on the end surface of the pressure relief valve housing 1 for installing and inserting one end of the heat pump air-conditioning compressor; an external thread is provided on the outer surface of the pressure relief valve housing 1, and the pressure relief valve housing 1 is fastened in the heat pump air-conditioning compressor through the external thread, so that the protruding ring tooth 8 is squeezed and sealed with the counterpart.

[0042] When selecting materials, the material of the sealing seat 6 is plastic. The plastic is one of polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene sulfide, polyetheretherketone, polysulfone, and polyarylsulfone. The material of the sealing seat pressing block 7 is one of stainless steel, aluminum alloy, titanium alloy, and copper alloy.

[0043] During specific implementation, the high temperature and high pressure resistant heat pump air conditioner pressure relief valve in this embodiment can be used for the R744 heat pump air conditioner pressure relief valve sealing structure.

[0044] External leakage will lead to a reduction in refrigerant in the air conditioning system, causing system components to be damaged and fail in the absence of refrigerant. Sealing area: sealing seat 6 and electronic valve or compressor body. Internal leakage: when the pressure of the electronic valve or compressor system reaches the preset pressure, such as 130bar, 170bar, the pressure is released to protect the system safety.

[0045] Realization of external leakage sealing: The pressure relief valve housing 1 is tightened by torque through the thread, and the protruding ring teeth 8 on the end surface of the housing are sealed with the counterpart on the heat pump air-conditioning compressor through extrusion.

[0046] Realization of internal leakage sealing:

[0047] 1. Tighten the sealing seat pressing block 7 by threading to give thrust to the sealing seat 6, and the outer conical surface of the sealing seat 6 and the inner conical surface of the pressure relief valve housing 1 are squeezed and sealed;

[0048] 2. By adjusting the spring compression, the slider is given thrust, and the slider pushes the sealing ball to squeeze the conical surface of the sealing seat to seal.

[0049] The hardness difference in this technical solution is:

[0050] a) Compressor housing (soft) - pressure relief valve housing (hard): the protruding ring teeth 8 on the end face of the pressure relief valve housing 1 are squeezed and embedded in the compressor housing seal;

[0051] b) Sealing seat (soft) - pressure relief valve housing (hard): the outer conical surface of the sealing seat 6 and the inner conical surface of the pressure relief valve housing 1 are squeezed and sealed;

[0052] c) Sealing seat (soft) - sealing ball (hard): The inner conical surface of the sealing seat 6 and the sealing ball 5 are squeezed and sealed.

[0053] During specific assembly, first press the protruding portion 71 at the end of the sealing seat pressing block 7 into the docking groove of the sealing seat 6, and pre-install the two. The pre-installed sealing seat 6 and the sealing seat pressing block 7 form a sealing kit, which is installed into the pressure relief valve housing 1. The sealing seat pressing block 7 is screwed into the pressure relief valve housing 1 through threads. With appropriate tightening torque, the sealing seat pressing block 7 pushes the outer cone surface of the sealing seat 6, i.e., the frustum-shaped sealing section 62, to squeeze and seal with the inner cone surface of the pressure relief valve housing 1. Install the sealing ball 5, which fits the inner cone surface of the sealing seat 6 to form a pressure seal.

[0054] Insert the slider 4, and the inner conical surface of the slider 4 presses the sealing ball 5 to form a pressure seal. The spring 3 is placed in the pressure relief valve housing 1 and falls vertically into the mounting hole of the slider 4. The pressure regulating nut 2 is screwed into the pressure relief valve housing 1. By adjusting the screwing depth of the pressure regulating nut 2, the slider 4 is adjusted to push the sealing ball 5 to exert pressure on the conical surface of the sealing seat 6 to seal. The applied force is the pressure relief opening pressure. The pressure relief valve housing 1 is screwed into the compressor housing through threads, and a suitable tightening torque is used to squeeze the protruding ring teeth 8 on the end face of the pressure relief valve housing 1 into the compressor housing for sealing.

[0055] Comparative Example 1

[0056] In the corresponding technical solutions of CN214743587U, a high-pressure-resistant and high-sealing heat pump air-conditioning pressure relief valve, and CN218000534U, a pressure relief valve for automobile air-conditioning systems, although the structures of the pressure relief valve housing, adjusting slider, spring, pressure regulating nut, and sealing ball are roughly the same, and the pressure relief principle is also similar, CN214743587U and CN218000534U both adopt an integrated sealing seat structure, wherein the integrated sealing seat structure is made of plastic material, which must contact the counterpart on the compressor and withstand a temperature of 180°. At the same time, it must be screwed to the inner wall of the pressure relief valve housing to provide axial resistance pressure to the sealing ball, which makes it easy to deform under working conditions, which can easily lead to functional damage or leakage.

[0057] Embodiment 1 of the present invention shows unique advantages through the sealing seat pressing block 7 and the sealing seat 6 assembled together by pre-pressing. The sealing seat made of non-metallic material is squeezed and sealed with the outer conical surface of the shell with a relatively small force, and the inner conical surface of the sealing seat is squeezed with the sealing ball to achieve an efficient internal sealing effect. This design not only optimizes the sealing performance, but also reduces the risk of damage to the internal structure caused by excessive pressure at working temperature. In addition, the sealing seat is given thrust by the sealing seat pressing block, which further enhances the stability and reliability of the internal seal, ensuring that the pressure relief valve can still function accurately and stably under high pressure, high temperature and vibration environment, greatly improving the overall performance and safety of the heat pump air conditioning system. A protruding ring tooth is set on the design end face of the shell. When it is tightened and installed with the compressor shell, the protruding ring tooth at the end can be firmly squeezed and embedded in the compressor end cover, achieving reliable external sealing and effectively preventing leakage of external media.

[0058] Verification Example 1

[0059] This verification example is to perform an alternating pressure test on the high temperature and high pressure resistant heat pump air conditioning pressure relief valve in Example 1.

[0060] Technical conditions:

[0061] Test pressure: Pmin 5.0Mpa~Pmax 14.5MPa, that is, fix the heat pump air conditioner pressure relief valve in Example 1 on the test bench, and apply a pressure within the above range to the end where the heat pump air conditioner compressor is installed for testing, see Figure 2 and 3 .

[0062] Pressure cycles: 150,000 times.

[0063] Medium temperature: (180±2)℃.

[0064] Test medium: Refrigeration compressor oil, viscosity: (5 to 6) mm at 100°C 2 / s.

[0065] Test curve (sine or trapezoidal): frequency 0.5Hz~1Hz.

[0066] Verification Example 1 uses three heat pump air conditioning pressure relief valves for parallel testing. The test results are shown in the following table:

[0067]

[0068] Verification Example 2

[0069] This verification example is to conduct an alternating temperature test on the high temperature and high pressure resistant heat pump air conditioning pressure relief valve in Example 1.

[0070] Technical conditions:

[0071] Test pressure: 14.5MPa

[0072] Temperature variation interval: -30℃~+175℃, that is, the heat pump air conditioner pressure relief valve in Example 1 is fixed on the test bench, and a temperature within the above range is applied to the end where the heat pump air conditioner compressor is installed for testing, see Figure 4 and 5 .

[0073] Heating and cooling rate: 1K / min.

[0074] Maintain at min / max for 30 minutes.

[0075] Duration: 460 minutes (30-200-30-200).

[0076] Total time: 77 hours.

[0077] Verification Example 2 uses three heat pump air conditioning pressure relief valves for parallel testing. The test results are shown in the following table:

[0078]

[0079] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve, comprising a pressure relief valve housing (1) provided with a chamber, wherein a sealing ball (5), a slider (4) and a spring (3) are provided in the chamber of the pressure relief valve housing (1), wherein the slider (4) is movably installed in the chamber, wherein an exhaust through hole is provided in the slider (4), wherein one end of the spring (3) is in contact with the slider (4), and the other end of the spring (3) is limited by a limiter (2), wherein: A sealing kit is provided on one end of the pressure relief valve housing (1) for installation and insertion into a heat pump air-conditioning compressor, the sealing kit comprising a sealing seat pressing block (7) and a sealing seat (6) pre-pressed and assembled together, the sealing seat pressing block (7) being screwed to the inner wall of the chamber of the pressure relief valve housing (1), the sealing seat (6) comprising an integrally formed first columnar section (61), a frustoconical sealing section (62), and a second columnar section (63); The top of the first columnar section (61) is capable of abutting and sealing against the sealing ball (5); The lower surface of the second columnar section (63) is interference-fitted with the top of the sealing seat pressing block (7), and the axial extrusion force provided by the sealing seat pressing block (7) causes the outer conical surface of the frustum-shaped sealing section (62) to be extruded and sealed with the inner wall of the chamber of the pressure relief valve housing (1).

2. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 1, characterized in that: The sealing seat pressing block (7) comprises a sealing seat pressing block body (72) and a protruding portion (71) arranged at the end of the sealing seat pressing block body (72), wherein the diameter of the protruding portion (71) is smaller than that of the sealing seat pressing block body (72); The sealing seat pressing block body (72) is provided with external threads.

3. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 2, characterized in that: A docking groove is formed on the lower surface of the second column-shaped section (63), and the protrusion (71) is interference-fitted with the docking groove.

4. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 1, characterized in that: The chamber of the pressure relief valve housing (1) is provided with a first straight section, a conical section (9), a second straight section, and a third straight section which match the sealing kit and are connected in sequence; The inner wall surface of the conical surface section (9) and the outer wall surface of the frustum-shaped sealing section (62) are squeezed and sealed.

5. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 4, characterized in that: The inner wall surface of the first straight section and the outer wall surface of the first columnar section (61) are clearance-matched; The inner wall surface of the second straight section and the outer wall surface of the second columnar section (63) are clearance-matched.

6. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 4, characterized in that: The third straight section is provided with an internal thread, and the internal thread cooperates with the external thread on the sealing seat pressing block body (72).

7. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 4, characterized in that: The end surface of the pressure relief valve housing (1) for installing and inserting the heat pump air-conditioning compressor is provided with a protruding ring tooth (8); An external thread is provided on the outer surface of the pressure relief valve housing (1), and the pressure relief valve housing (1) is fastened in the heat pump air-conditioning compressor via the external thread, so that the protruding ring teeth (8) are squeezed and sealed with the counterpart.

8. The high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 1, characterized in that: The material of the sealing seat (6) is plastic.

9. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 8, characterized in that: The plastic is one of polytetrafluoroethylene, polyvinylidene fluoride, polyphenylene sulfide, polyetheretherketone, polysulfone and polyarylsulfone.

10. A high temperature and high pressure resistant heat pump air conditioner pressure relief valve according to claim 1, characterized in that: The material of the sealing seat pressing block (7) is one of stainless steel, aluminum alloy, titanium alloy and copper alloy.

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