JP5773610B2 - Compound valve - Google Patents

Description

  The present invention relates to a composite valve that is used in a refrigeration cycle of an air conditioner or the like, and that an expansion valve is integrally equipped with a solenoid valve and a check valve.

  In the refrigeration cycle of an air conditioner (air conditioner), the refrigerant pressurized by the compressor is sent to a condenser to be converted into a high-pressure liquid refrigerant. The low-pressure refrigerant evaporated by performing heat exchange is returned to the compressor.

  FIG. 7 shows a refrigeration cycle of an air conditioner equipped with two evaporators. The refrigerant pressurized by the compressor 1 is liquefied by the condenser 2 and is switched to the first evaporator 5a side or second by the switching valve 3. Is switched to the evaporator 5b side.

Expansion valves 4a and 4b are provided between the switching valve 3 and the evaporators 5a and 5b, respectively.
That is, in a refrigeration cycle of an air conditioner using two evaporators, a switching valve for switching the refrigerant flow is necessary. In this case, there are problems that the number of pipe connection points increases and the work is troublesome and refrigerant leakage from the pipe connection points easily occurs.

  Then, a piping connection location can be reduced by comprising a cycle using the composite valve which was equipped with the solenoid valve and the non-return valve integrally in the expansion valve which is disclosed by patent document 1. FIG. However, in this composite valve, there is a problem that it is not easy to assemble the check valve into the valve body, and the productivity is not good.

Japanese Patent Laying-Open No. 2005-291679

  An object of the present invention is to provide a composite valve in which an expansion valve is integrally equipped with a solenoid valve and a check valve, and has good assemblability.

To achieve the above object, the composite valve of the present invention includes an inlet passage through which refrigerant from a condenser flows in, an outlet passage through which refrigerant flowing toward an evaporator flows out, an orifice formed between the inlet passage and the outlet passage, And a valve body having a return passage through which refrigerant returning from the evaporator to the compressor passes, a valve body for adjusting the opening of the orifice, and a drive for driving the valve body based on the temperature of the refrigerant passing through the return passage A composite valve comprising: a device; an electromagnetic valve that opens and closes a passage between the inlet passage and the orifice; and a check valve that is disposed in the return passage and blocks refrigerant that flows back in the return passage. The drive device passes through the return passage, and the check valve is connected to the return valve with respect to an annular valve seat formed on an inner peripheral surface downstream of the drive device. A check valve body disposed on the outlet side of the check valve, and protruding from the check valve body toward the valve seat and slidably inserted into a valve port of the valve seat, A guide portion that guides the valve seat in a direction of contact with and away from the valve seat, and the guide portion is inserted into the valve opening of the valve seat by pushing the check valve from the return passage outlet into the return passage. The check valve is attached to the return passage, and a stopper portion that protrudes toward the outlet side of the return passage is provided on the check valve, and an end of a pipe that is inserted into the return passage from the outlet side. The stopper portion is brought into contact with a portion to restrict movement of the check valve in the opening direction .

  According to the present invention, the check valve can be attached to the valve body simply by pushing it into the return passage, so that the assemblability is improved and the productivity is improved.

The longitudinal cross-sectional view of the compound valve of this invention. The left view of the compound valve of this invention. The right view of the compound valve of this invention. The cross-sectional view of the principal part of the composite valve of this invention. The front view, left view, and right view of a check valve. The enlarged view of the principal part of FIG. Explanatory drawing which shows the refrigerating cycle for air-conditioners using a switching valve. Explanatory drawing which shows the refrigerating cycle for air-conditioners using a composite valve.

1 is a longitudinal sectional view of the composite valve of the present invention, FIG. 2 is a left side view of FIG. 1, FIG. 3 is a right side view of FIG. 2, and FIG.
The composite valve generally indicated by reference numeral 10 has a prismatic valve body 20. The valve body 20 has an inlet passage 30 to which refrigerant from the condenser is supplied, an outlet passage 32 through which refrigerant flows toward the evaporator, a return passage 34 through which refrigerant returns from the evaporator to the compressor, and a bolt for attaching to the evaporator. The hole 92 and the bottomed screw hole 90 for fixing the flange for piping are provided. The refrigerant introduced from the inlet passage 30 is sent to an electromagnetic valve 40 described later.

  A valve chamber 51 is formed between the inlet passage 30 and the outlet passage 32, and an orifice 31 is formed at the boundary between the valve chamber 51 and the outlet passage 32. A valve body 50 is disposed in the valve chamber 51 so as to face the orifice 31, and the valve body 50 is supported by a support 52. The opening of the valve chamber 51 is sealed with a nut-like plug 56 and an O-ring 57, and a coil spring 54 is disposed between the plug 56 and the support 52. The refrigerant that has been squeezed and expanded by the orifice 31 is sent from the outlet passage 32 to the evaporator.

  The refrigerant returning from the evaporator to the compressor flows in from the inlet 34a of the return passage 34 of the valve body 20, and is sent to the compressor side through the check valve chamber 36 and the outlet 34b. A check valve 100 is provided in the return passage 34.

  A power element 70 that drives the valve body 50 based on the temperature of the refrigerant passing through the return passage 34 is provided on the upper portion of the valve body 20. The power element 70 has an upper pressure chamber 74 and a lower pressure chamber 76 formed with the diaphragm 72 interposed therebetween, and the displacement of the diaphragm 72 is transmitted to the operating rod 80 via the support 78. The operating rod 80 operates the valve body 50 to adjust the opening degree of the orifice 31.

  As shown in FIG. 4, the electromagnetic valve 40 includes an electromagnetic valve chamber 42 provided between the inlet passage 30 and the valve chamber 51, and is equipped with an opening / closing valve body 44 that opens and closes a passage 47 communicating with the valve chamber 51. Is done. The electromagnetic valve 40 includes an attractor 41 that generates a magnetic force by an exciting coil 45 and drives a plunger 46. When the plunger 46 is sucked to the suction element 41 side, the opening / closing valve body 44 is opened to supply the refrigerant to the valve chamber 51 side.

FIG. 5 is an explanatory diagram showing details of the check valve 100.
The check valve 100 is made of plastic or the like, and is a disc-shaped check valve main body 105, three stopper portions 110 protruding from the check valve main body 105 toward the outlet 34b of the return passage 34, and a check valve main body. Three guide portions 120 projecting from the return passage 34 toward the inlet 34 a side are provided, and an elastic annular seal member 130 is fitted between the check valve main body 105 and the guide portion 120. .

  As shown in FIG. 6, an annular valve seat 35 having a smaller inner diameter than the outlet 34 b of the return passage 34 is provided between the inlet 34 a of the return passage 34 and the check valve chamber 36 in which the check valve 100 is provided. Is formed. The outlet 34b is a straight passage, and the check valve 100 is inserted into the check valve chamber 36 from the outlet 34b side. The guide part 120 is elastically bent inward when the leading end stopper 122 is in contact with the valve seat 35, and when the stopper part 122 passes through the valve opening inside the valve seat 35, the guide part 120 is elastically returned to the original state. To do. As a result, the retaining portion 122 is prevented from engaging with the first tapered portion 35 a of the valve seat 35 and the guide portion 120 is prevented from coming out to the outlet 34 b side of the return passage 34. In this state, the check valve 100 is movable in a direction in which it comes in contact with and separates from the valve seat 35.

  The pipe 200 is inserted into the outlet 34b in which the check valve 100 is inserted. The pipe 200 has an O-ring 220, and the distal end portion 210 of the pipe 200 is in contact with the distal end portion 112 of the stopper portion 110 of the check valve 100 and serves as a stopper that prevents the check valve 100 from coming out to the outlet 34b side. Function. By doing in this way, it can prevent more reliably that the non-return valve 100 detach | leaves from the valve seat 35. FIG.

  FIG. 6 shows a normal state in which the refrigerant in the return passage 34 flows from the inlet 34a toward the outlet 34b. In this state, the check valve 100 is maintained at a position where the seal member 130 is separated from the valve seat 35, and the refrigerant can pass through the valve port of the valve seat 35. When the refrigerant flows backward from the outlet 34b toward the inlet 34a, the check valve 100 slides in the left direction of FIG. 6 (inlet 34a side), and as shown in FIG. 2 is pressed by the second tapered portion 35b to seal between the check valve 100 and the valve seat 35, thereby preventing the refrigerant from flowing backward. By providing the seal member 130, it is possible to reliably prevent the refrigerant from leaking.

As described above, the composite valve of the present invention is configured by integrating the expansion valve, the electromagnetic valve, and the check valve, so that it can be easily assembled to the air conditioner system, and the number of pipe connection points is reduced. Refrigerant leakage can be reduced.
In addition, the check valve incorporated in the composite valve can be manufactured easily and inexpensively by plastic molding, and in addition, it can be easily mounted on the valve body with a single touch, so that the productivity is good.

  In addition, this invention is not limited to the said Example, A various change is possible. For example, the number of stopper portions 110 and guide portions 120 is not limited to three. Moreover, you may make it prevent the detachment | leave from the valve seat 35 of the non-return valve 100 by another means instead of providing the retaining part 122 in the guide part 120. FIG. The composite valve of the present invention can also be applied to a refrigeration cycle having two or more evaporators. In addition, various modifications can be made to the above embodiment without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Composite valve 20 Valve body 30 Inlet passage 31 Orifice 32 Outlet passage 34 Return passage 35 Valve seat 36 Check valve chamber 40 Solenoid valve 50 Valve body 51 Valve chamber 52 Support 54 Spring 70 Power element (drive device)
80 Actuating rod 100 Check valve 105 Check valve body 110 Stopper portion 120 Guide portion 122 Stopping portion 130 Seal member

Claims (4)

An inlet passage through which refrigerant from the condenser flows in, an outlet passage through which refrigerant flows toward the evaporator, an orifice formed between the inlet passage and the outlet passage, and a return passage through which the refrigerant returning from the evaporator to the compressor passes are provided. A valve body, a valve body that adjusts the opening of the orifice, a drive device that drives the valve body based on the temperature of the refrigerant passing through the return passage, and a passage between the inlet passage and the orifice. And a check valve disposed in the return passage and blocking a refrigerant that flows back in the return passage, wherein the drive device passes through the return passage, The check valve includes a check valve body disposed on an outlet side of the return passage with respect to an annular valve seat formed on an inner peripheral surface downstream of the driving device in the return passage, and the check valve valve A guide portion that protrudes from the body toward the valve seat and is slidably inserted into a valve port of the valve seat, and guides the check valve body in a direction to contact and separate from the valve seat, by pushing the check valve in the return passage from the outlet of the return passage, wherein the guide portion is inserted into the valve port of the valve seat so the check valve is mounted on said return passage, said reverse A stopper portion that protrudes toward the outlet side of the return passage is provided on the stop valve, and the stopper portion abuts on an end portion of a pipe that is inserted into the return passage from the outlet side. A composite valve that regulates movement to   2. The composite valve according to claim 1, further comprising a retaining portion that prevents the guide portion from slipping out from the valve port of the valve seat toward the outlet side of the return passage.   The guide portion has flexibility, and when the check valve is pushed into the return passage, the guide portion is bent and the retaining portion is engaged with a portion of the valve seat on the inlet side of the return passage. The composite valve according to claim 2, which is combined.   The composite valve according to any one of claims 1 to 3, wherein the check valve includes a seal member that contacts the valve seat and seals between the check valve and the valve seat.

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